Worst Ever BCG AUTOPSY caught on camera. (See description)

[@crispy9175]

Years ago I was an armorer in the Army... if the Army had taken the time to teach me this 15 minutes worth of information it would have been invaluable to the unit. As is I'm glad I know it now, better late than never. Thanks for the incredible video. Never subscribed faster.

[@m1a1abrams93]

I was a company armorer also. It was not my main MOS. late 80s early 90s. I learned then they only want you to know the basics. I took it upon myself to learn. I was an E-4 at the time & they sent me to HQ arms room to help an E6 get his room in order. I spent a lot of free time disassembling, assembling weapons well above my grade. I also learned to get extra parts to have on hand. Just hide them during inspections. I also acquired parts that were not within my level (gas rings, extractors, springs, roll pins, etc). Better to have & not need than to need & not have. It always seemed to ring true in the field (live fire). I also used to take my tank apart to get ready for inspections. It was easier to repaint parts & get into the tight areas. Kept the tank looking new. We had the 1911 for personal weapon. Not much would go wrong with them. For we didn't really fire them often. Just something to lug around & get dirty. I never did get the Beretta besides being the first unit to use them in boot camp. This guy would have made a excellent armorer. Thorough & starts at the basics. The Army used to offer a course for gunsmiths. Credited on your personal time. It was mostly different types of military weapon systems (machineguns).

[@crispy9175]

@@m1a1abrams93 sounds like the headaches are a constant throughout the generations. The Beretta was great. Got a good bit of time in with that one. I was running the ledger when we got the new M17s in. I never got to fire one, but I did like that you could swap out the polymer frame/body or whatever it's called, but I liked the ergonomics and features of the m9 better. My Walther PPQ is another story though. Took my shooting up a notch.

[@kaasmeester5903]

@@m1a1abrams93 Why hide the spares? Are you not allowed to keep spares on hand?

[@Max_Da_G]

@@kaasmeester5903 Everything in the military has to be accounted for and stuff that isn't acquired through the chain of command and supply system could possibly get him in trouble. Just a guesstimation.

[@blackopsrocks]

Then you recognize a depot reject BCG that has been cleaned aggressively, coated and repackaged with super cheap bare minimum springs, gas rings. Note exactly which measurements are no go and/or under sized, everwhere every soldier has ever been told to clean way too much.

[@phil5569]

Note to self, never buy a bolt carrier group unless the company is proud enough of their product to mark it.

[@MellowFellowOfYellow]

LMT says hello

[@pacman10182]

on the other hand, my AR is all no name except the Anderson lower, and runs flawlessly

[@crazydave1145]

Don't buy gold colored guns😉

[@notamouse5630]

@@crazydave1145 The coating is a good idea, Titanium Nitride reduces friction, wear, and corrosion. The additional clearances that were put with the really thin coating were not acceptable. I think somebody guessed and didn't check.

[@crazydave1145]

@@notamouse5630 I never said anything about the coating, just the color🤦‍♂️

[@PilotTed]

Most "gunsmiths" who specialize in ARs are really just armorers and don't go any where near as in-depth as you. You are definitely a gunsmith. BTW, that cutaway is awesome, and would love to get one myself.

[@StudleyDuderight]

Is he a "defiant" gunsmith, or is he a definite* gunsmith?

[@PilotTed]

@@StudleyDuderight fixed it, damn auto correct was sneaky.

[@Pipitarutor]

like my grandfather used to say about car mechanics. There is a difference between a mechanic and a part changer. "Anyone" can assemble a firearm, but how many can actually build one.

[@JeffHuntsinger]

Your confirmation of his occupation is SURELY a huge relief to him. 😏

[@derekbutts1782]

An armorer can assemble a weapon a gunsmith can make the parts.

[@Sluggaboy27]

Chad, I must say your archive of information is very impressive. I bing watch daily and learn something new every day. I appreciate your professionalism and attention to detail.

[@muddyhotdog4103]

That edm cut-away of that bcg is pretty cool.. It was done perfectly

[@elbryan9]

I wanna know where to get one.

[@crdowney1]

That was amazing, I could look at that thing all day.

[@6daemonic6]

Call your local community college and see if they offer machine tool technology . If they have an edm in their school the students would gladly cut your bcg in half for ya. Hell they would be happy to mill it in half as well really

[@sharptungsten1970]

Typically if they have an EDM they are doing something that requires perfection lol.

[@chadh3441]

The community college idea is a great recommendation. My dad taught machine shop at our local community college for over a decade. They would probably do it for free just for the experience. I know in the class where my dad taught, there was a glass display cabinet where students would place items that they had machined themselves as a sort of testament to what things could be done by trained machinist in the beginning stage. It really helped to inspire new students. They could ask you if they could keep the other half of the cut out for the same reason.

[@augreich]

As a Mechanical Quality Inspector I really love the 100% inspection that you do to find the problems. I'm impressed with the gauging you use and your understanding of why they are necessary. In a production setting I'll perform inspections per the the Print and customers requirements. Often times I won't know the "why" of certain dimensions. New Sub to your channel as you are a wealth of knowledge!!

[@nunyabeeswax2575]

Been hanging out for this for ages. Glad to have you back.

[@nickolaserickson2106]

Very awesome talk through of a subject many AR users do NOT understand. Unfortunately, too many novice shooters think that added "slop" make the AR run more reliable, like an AK. THanks for putting this together. TR

[@brian_b_music]

Not only AKs , but just think of all the people that are used to Glocks. So I see why people might equate loose tolerances or “slop” to reliability.

[@hilltop4847]

"too many novice shooters think that added "slop" make the AR run more reliable..." Really!? I've been shooting over 20 years and have never heard a single person say that.

[@brian_b_music]

@@hilltop4847 I have definitely heard a few people say that. I don’t think that, but I understand why so many people do. 9/10 people I know own glocks, and think loose tolerances are a good thing.

[@angry_zergling]

But, but, but...loose tolerances let rocks and dirt work themselves free of the bolt dood! That's why AKs NEVER fail - you can pour communist rocks through the ejection port using a Warsaw shovel and they'll simply get blown back out! Oh-ho-ho! That's been said many times, but one of the good things about our modern area and the internet is that it allows the average person to test things these for themselves and post proof of their results. So there are several videos out there of people shoveling muck atop AK-patterns and AR-patterns and comparing their performance...and many would be surprised to learn all but the most cruddy AR will run in the face of what causes AKs made of some of the most legendary, most authentic, most Russian parts kits seize up. Disclaimer: Of course, there are exceptions between certain individual guns/builds, different tests, etc - but overall? Yeah - much easier to lock up an AK short term than an AR. Disclaimer2: In the AK's defense, it does indeed seem easier to get running again after nearly melting the barrel and then banging that drooping barrel with a hammer until it is straight and having your friend's T80 tank run over the bolt to get it to fit again, or digging one up after it's been in the dirt for 40 years and throwing it against a hill to chip off the rust...but - in all but the most extreme circumstances with the most extreme lack of spare parts and gunsmiths and lubrication and literally decades of neglect...AR > AK.

[@sabiti5428]

Tbh an AK runs better when tolerances are met too. It's just that the design allows for more slop without affecting function.

[@dakotagarcia3772]

Please double check with your customer to see where he got this BCG from, so no one else has to suffer these issues.

[@nathanjohnson9231]

@@GrumpyGenXGramps It's a sample of one, with 9 critical dimensions out of spec? That's not a QC mistake, that's just not knowing the specs or not caring.

[@robertkouns3078]

Maybe an AIM BCG?

[@GTFBITK]

I would like to know what the customer says as well.

[@leadhead7338]

I figured he just didnt tell us the manufacturer, because he didnt want them to see the bad review?

[@KidCorporate]

@@robertkouns3078 That's what I thought but I can't find any pics of them with "Made in USA" or those numbers on the tail.

[@shreks_loins3963]

Wow, I have always wondered how precise the parts of a BCG had to be machined in order to allow for proper and efficient function. However, I wasn’t expecting that something as minute as the firing pin hole size was such a critical failure point. Thank you for the content! I’m glad I stumbled across your channel!

[@MaverickTangent]

I know these videos are tough to make with lives and busy schedules, but I love them when you make them

[@TrashPanda338]

Been a gunsmith for almost 15 years. I learned a thing or two today. Bravo sir.

[@madcratebuilder]

50+ years with this platform and this is the best BCG video I have seen, very well done sir.

[@thamomentum]

So an engineer's perspective here. You have so much interpolation of tolerances here. I wouldn't be surprised if the whole assembly is a no-go. Thanks for the vid!

[@2amichaelj]

As a former military United States Army Corp of Engineers combat veteran, I don't understand why they don't teach more about this kind of material in our military. This is valuable information and I've learned so much more about the AR15 platform than anything I was trained in the Army. This kind of information could save lives not to mention tax dollars and money.

[@Yahweh-Chase-Bella]

Ya the military really teaches the bare minimum to keep things rolling

[@shane35fowler]

Should have taken the Unit Armorer course.... Learn Most of this .... Or at least I did 🤷🏼‍♂️

[@DavidMartin-jr8nd]

I took that course. It was basically "this is a gun. It makes you do paperwork. The gun works like this, but you aren't allowed to check or do anything to it. The module on paperwork is telling you that there is paperwork. You are now legally liable for 14 mil. Bye."

[@Blackline9114]

They don’t teach it because it’s not relevant to the job. You’re not a gunsmith in the military, you’re an armorer and your job is to swap parts, not make repairs. If a gas key bolt snaps on a carrier, do you replace the bolt or do you scrap the whole carrier out for a new one? See what I mean? It would be inefficient to teach an armory anything more beyond basic troubleshooting and part swapping.

[@2amichaelj]

@@Blackline9114 the information is still helpful. Imagine your weapon system going down and all is needed is the gas key being torqued down. Being able to problem solve in the field is something I would've thought a benefit. I mean every soldiers first job is an infantry man.

[@dougbourdo2589]

Received a lot of new "AR15's" from a quality mfr. years ago for my Sheriff's Dept. On first day of issue & initial inspection & firing of the newly issued carbines, six were having function problems. No one was able to determine what the issue was. As a Colt trained Armorer for the AR15/M16 line of weapons, I had a hunch but was not there to witness the issues. I took the six carbines to our shop & found them all to have the hammer spring installed backwards from original assembly; exactly as I suspected. They worked flawlessly after proper installation. No other flaws were observed. I wrote up a report as to findings & notified the Mfr. They were very apologetic and based on the serial numbers were able to determine what staff person did the assemblies. Apparently that same person had similar issues in his past and was relieved of his employ there. Thankfully the issues were minor with no damage or injury resulting.

[@flooid5506]

You would think QC would function check guns being shipped to a law enforcement agency

[@sunlight-sky151]

@peter Almost a zero percent chance the guy was like "yeah we know who done it and we'll fire him too!"

[@johnnyt3972]

Maybe just turn their bench around

[@CatDaddySteve]

He was the guy who always wore his ball cap on backwards 🤣

[@MrJunkman1982]

I don't get how someone installs springs back asswards? Unless they are not very bright to begin with

[@Bravo27Alpha]

The cutaway bcg is awesome what a cool gift

[@DACFalloutRanger]

I need one of those lol

[@seanoneil277]

Thank you for another detailed autopsy that helps us understand how the rifle works, and why proper dimensional tolerance matters.

[@Broney-tw3vy]

It seems like the manufacturer over-shot a machining process that was meant to make up for the thickness of the cool guy coating. Unless I start shooting pro ( which I will likely never do), I will stick with boring but functional milspec with no super cool coatings.

[@johnkruer7557]

Plus side for the BCG is that it looks gold. Thumbs Up

[@blueishgreen76]

Yep. The manufacturer was likely using the same parts machined for a hard chrome coating (which can easily exceed .002" thickness) that they used for the titanium nitride coating here (which rarely exceeds .0002" thickness). There's nothing inherently wrong with coatings, especial nitriding, which is actually a case hardening process that doesn't affect dimension much. The issue is that you shouldn't cheap out if your going for the bling like hard chrome or TiN.

[@seanoneil277]

Parts made for collectors of Safe Queens, fancy cosmetics and questionable functionality. Function is irrelevant to the collector and appearance is everything. It undermines the whole forearms making & selling "industry," and renders many components and complete firearms as useful only for internet fame in poseur audiences. Is that really good?

[@darrengarcia4937]

@@seanoneil277 Titanium Nitride is a good coating. Dont Blue your guns, or cerakote, or parkerize, leave it bare bones metal because coatings are only cosmetic

[@dannygreen5878]

I don't use coatings on a bcg because they can peel. I have already had it happen to a Nib bcg. I only buy nitride or parkerized, they are metal treatments and won't peel.

[@LeeG7953]

Thank you for the video. When I was in the Army as a Infantryman my Armorer taught me a lot about my M16 A1. Of courses kept back some things that I really didn’t need to know like what you just demonstrated.

[@rogerloess2379]

Air gap around firing pin is one of the most frustrating things as a reloader. I got a Midway bcg and some asshat chamfered the firing pin hole so every spent casing has a cratered primer. Not a safety issue but makes it impossible to look for one of the most obvious pressure issues

[@clinkerclint]

I hear ya. I bought eight of them from DSG that all were chamfered and I didn't realize it. I ran some reloads and every case had a cratered primer. Scared me because I thought I had made a mistake in my reloading. Took me a while to figure it out. I have no idea if DSG still does this.

[@rogerloess2379]

@@clinkerclint exactly.

[@pcpolice7937]

@@clinkerclint I feel a bit ignorant here, but who is DSG? Thanks

[@clinkerclint]

@@pcpolice7937 I had the wrong company in my head. DRG is where I bought those BCGs. They are part of White Label Armory.

[@PC-vq5ud]

Please try a Maxim brand replacement bolt and tell us how it goes.

[@Oggy_597]

This looks very similar to a Big Daddy Unlimited bcg I had for a very short time. I never even put it in my gun, because it sat around in the packaging for a while until other parts came in. In the roughly 1 month time period of it just sitting in my house, it started to spot rust with 0 exposure or use. Returned it immediately after finding that out.

[@RichardCranium321]

BDU has lost it. they put profit above principle

[@RichardCranium321]

BDU has lost it. they put profit above principle

[@Oggy_597]

@Richard Cranium 100%. I had been on the edge about keeping my subscription for a long time. But after seeing how they handled the whole FRT/WOT trigger fiasco, I canceled it.

[@RichardCranium321]

@@Oggy_597 not just that, they hired Tim Kennedy for an obscene amount of $ even after his multiple anti2a statements & being warned by their other partners. Following that, they then started selling stickers with Kyle Rittenhouse on them saying something like "be a man amongst men" even though they avoided the story like the plague & didn't have a word to say positive or negative, but they'll damn sure make a $ by shamelessly exploiting images of a minor for their own financial gains. If they wanted to sell stuff & donate proceeds to him then that'd be one thing, but every penny from that gear goes straight into their pocket... I'm done with them & even though I can't afford a $400 trigger, I bought some swag just to show support for the guys actually fighting for our rights instead of selling them off to someone like Tim Kennedy. Sure he served, but he thinks the 2nd amendment essentially means the national guard & doesn't believe it applies to "we, the people"...

[@superfamilyallosauridae6505]

@@RichardCranium321 nothing pisses me off like people turning kyle rittenhouse into a meme. let the dude move on, jesus. he's not somebody's meme, he's just some dude. who got exploited by his first lawyer, who effectively stole literal millions of dollars pro-2a people donated for his legal fees from him, and kept him in jail over a month after the money for his bail had been raised. then, he had neo-nazis guarding him without his knowledge. shady shit man. justice was served, and most of the 2A meme hype surrounding it is fucking disgusting.

[@michaelthacker6121]

Wow thats tough. Hopefully whoever is making those just flubbed this one. I would hate to see someone really save to get it for there only build just to be let down. Thank you for the videos. Your work has helped me with parts selection and also just proper methods. Again thank you!

[@NoName-tq9fi]

As a long-time machinist, you don't just "flub" nearly a dozen critical dimensions. This is plain pathetic. And also what you get when you try and save $20.

[@johnekare8376]

With the lack of markings I was thinking it's a 'home made' one, and perhaps they over accounted for the coating.

[@ATINKERER]

You're an amazing gunsmith! I don't think 1 in 100 gunsmiths are set up or knowledgeable enough to do what you did here.

[@Hjerte_Verke]

I bet they are. He just has a set of go, no-go and field gauges *like most reputable gunsmiths do*. Most of them are smart and don't want to teach everyone on KZbin how to do their job for free as it leads to lost sales.

[@disgruntledgrunt241]

When tricking out your rifle with shiny shit outweighs getting quality components. First red flag should've been the unwillingness for the manufacturer to stamp their name on it.

[@blue03r6]

I've never seen any stamped with a name. And a machining company still stamping things is stuck in the past when laser etching exist

[@MellowFellowOfYellow]

This is so meaningless. LMT NEVER puts their logo on their bolts and even Daniel Defense doesn't always have them. You check the quality of a BCG by testing it and examining it. Not by looking at a logo and calling it good

[@disgruntledgrunt241]

Don't remember saying anything about relying on a logo to call it good and when you buy from reputable manufacturers you already know where it's from.

[@dsandoval9396]

Reminds me of those Khyber Pass guns made that have markings with zero understanding for their meaning. I remember various markings from different actual manufacturers on _one_ handgun, another *handgun* had sight makings out past 1000 yards. Real life meme worthy stuff.

[@gfan1972]

I am in the market for a new BCG and found this video and am blown away with how well you broke everything down! Just an awesome and informative overview, thanks.

[@cjanquart]

The cutaway model of the BCG is great (I knew you'd have something like that in your shop).

[@mikewallace119]

I work in tool and die. I've built my AR. I've only built one. So I am no expert. I must have got lucky because mine ran 500 rounds with zero issues. This guy has just taught me a shit ton of information I didn't know... I knew there were tight tolerances but this information is invaluable... Thank you for going over all of this... Just subscribed.

[@frostriver4547]

Worth the wait! Thank you and hope you keep feeling better

[@clint2211]

Chad, I'm glad you're feeling better. I always look forward to your videos. "Rebel" probably asked "Did you get that BCG from my litter box?"

[@Romuls753]

No wonder the manufacturer didn't brand this BCG

[@toddy2519]

I was thinking the same exact thought!

[@larrycook8540]

Any manufacturer is going to have out of spec components. Some would recalibrate and toss the rejects. These days, particularly in some countries, there is a market for low quality items. Agree that lack of a manufacturer's logo should be a red flag.

[@sydecarnutz972]

Makes me wonder about the unmarked ones I see from big sellers!

[@armandgun]

Where does someone get a gauge set like that?

[@luxuryxcoffin]

Arm&Gun being sneaky in the armorer comments.

[@fudgerounds91]

@@IhateKZbin This man literally has a collection larger than most museums, he can afford it.

[@IhateYoutube]

@@fudgerounds91 Well see the thing is with comments. Sometimes they're not just for one person. I'm sure at some point someone else may come along, see the comment and go look at them and go ""wow those are pricey". :)

[@fudgerounds91]

@@IhateKZbin That's nice, but Arm&Gun can afford it.

[@IhateYoutube]

@@fudgerounds91 That's wonderful.

[@matthewbeaver5026]

Be nice to know which manufacturer was putting out this junk! Love the vids. Always learn something new.

[@tulpasconstructor2711]

Just gonna leave this here to see if this dude is actually serious lol

[@blackdragon44]

@@boygonewhoopdataZZ don't just make shit up also that's not a bcm bcg

[@Mag_Aoidh]

I was an LE armorer and actually went to a Colt M16/M4 armorers school. Nothing compared to this simple video, just the basic tear down/assembly and function tests. Retired, I can still do it blindfolded, but this would’ve really helped some troubleshooting I had to do on my own through the years.

[@edwardjmcmahon150]

Cool bolt carrier cutaway!

[@Braindoner101]

The cutaway is actually the reason I clicked on the video. It’s pretty cool!

[@MrTylero28]

Agreed! I love stuff like that

[@throngcleaver]

Agreed! It's so cool that I'll have to make one!

[@RT6Speed]

Man, what a great video. I've worked on AR's for years but feel like I learned a hell of a lot watching this. Bookmarked, will watch again if I encounter one with problems. Excellent.

[@slowhand1198]

You've shown just how much we take for granted sometimes. Thanks!

[@garythegunnut2711]

Yes, I agree with what the others have posted here, very well demonstrated tutorial that should be included in all armorer's courses. I am a seasoned 50 year old leo, ffl, sot3, armorer, instructor and learned something in every minute of this video. Well done

[@xnorcal831x]

Glad to see you posting. Stay healthy and stay safe. It's always worth the wait.

[@justinwatts2273]

Your videos are a master class on how to diagnose problems with your AR. Thank you for teaching this.

[@footballjunkie34]

Glad you’re feeling better. Great video as always!

[@p2o8wer]

I’ve learned so much in just two videos. I can’t wait to dive in on a Saturday morning and watch every video while examining my BCG out of my colt epr. I love you tube.

[@zohan90210]

i've always found firearms to be fascinating, not because of what can be done with them but the engineering that goes into them. after all, the difference between a rifle and a hand grenade can be just a few thousandths of an inch.

[@MrBrandokittycat]

Right off the bat one should be suspicious of nitride coatings on wear parts.(nickel boron and titanium nitride) There`s just too many "out of tolerances" to think this bolt and bolt body came directly from a manufacturer. More like surplus parts that are worn slap-dab out...bead blasted or vapor honed...nitride coated to look pretty and sold to customers that have no means of checking. This person has gauges in the video that are not cheap and many AR builders are not willing to pay the price. Being a retired T&D machinist (not selling any of my measuring tools) I can check dimensions accordingly, however, fortunate to appreciate and purchase special gauges. Excellent video...in fact...the best and most thoroughly ever watched!!!

[@MrTylero28]

I can’t get enough of this stuff! Thank you for your hard work and efforts Chad!

[@indigohammer5732]

I don’t own any firearms, but you’ve clearly explained and demonstrated the operating principles of the BCG and the inherent flaws in this example. A wonderful presentation. Thank you.

[@jgrenwod]

Great demonstration of the workings of the bcg. I think there are lots of out of spec bcg components out there that we dont see because they still allow the rifle to function. In this case the out of spec bolt prevented lockup and a close inspection revealed all the other defects. I purchased a side charging LR-308 upper from a manufacturer in the South East last year and it had an interesting malfunction. It would try eject the fired case to the left and of course jam up the works. After screwing with it I realized the bolt could be assembled 180° out because the cam pin would go in from either side. Tried calling the manufacturer but they don't list a phone number. Posted a review explaining what I had discovered and the owner contacted me. He tried to tell me it was no big deal. I said I wanted a replacement. He wouldn't replace the bolt until he received the old one first and I'd have to eat the shipping. So much for customer service. I bought one (not from him) and let him know I'd be using his bolt for show and tell at the next AZ rifle and pistol association meeting.

[@christophermeyer3980]

I just found this channel and I am glad I did. I am getting ready to buy my first AR and your channel is god send to me for understanding how the AR platform works. I am planning on getting a Springfield Saint Victor, and the first thing I will do is take it apart and give it a good cleaning and look for any defects on the BCG. You sir are a real gunsmith, glad to be a subscriber.👏

[@mitchbertone3809]

Great video, thank you. I hope the customer didn't pay more than 29 cents for that BCG...

[@paulthecpa2717]

I've been following you for some time. Watching all these no-go gauges never failing on anything. Then FINALLY, my prayers are answered, and I get to see the firing pin opening no-go gauge register a fail... Lord, I have arrived at the promise land as they say. :). Well done Sir, well done...

[@Fudmottin]

I have a BCG from Brownells that looks just like that. I haven't test fired it yet and I don't have all those gauges. This video put a bit of worry into me. It wasn't a cheap BCG.

[@OddBallPerformance]

Brownells is a good company to buy from. If you have issues they will work with you to fix them.

[@Fudmottin]

@@OddBallPerformance It's in an Aero Precision M4 upper with 16" barrel and mid length gas tube. If I get short stroking, the BCG will be my first suspect.

[@blackperl6677]

Excellent video, explanation and review!! I have learned a lot about my AR but never to this level of detail and explanation. Superb!

[@petermonck5448]

Informative and helpful as always. Thanks again. 👍

[@Treasuremonk]

As a former Surgical tech, absolutely like a Surgeon explaining during a surgical procedure! Thank you

[@EARNTHM111]

Don't know if you ever made a video about this but which BCG's would you suggest, maybe your top five list?

[@wintonhudelson2252]

Yes, thank you. I would like to know and likely another 1,000 people out there would too.

[@blackdragon44]

Be interested to know as well

[@caseydutchess2522]

I'm not an expert but you can expect a quality bcg from Sons of Liberty gun works(solgw), Forward Controls design(fcd), Sionics, BCM, and Modern Armory. 👍

[@yeshua1176]

@@wintonhudelson2252 he points out in another video his go to is bcm I believe Colt is mentioned as well not new Colt but older Colt with roll marks

[@chocolatemonk]

@@5jjt there are like 3 or 4 major actual manufactures of AR-15 parts and then they are rebranded to all the various. Aero precision is a solid affordable option

[@ericsfishingadventures4433]

I've been having issues of my firing pin not fully engaging the primer properly every few rounds or so, this video really helped me understand some of the issues I might be having. I figured it was a new bcg so thought maybe the bcg wasn't going into battery properly or something. Now thar I've watched this I know what ti look for to diagnose my problem. This was super helpful, THANK YOU!

[@ZE0XE0]

i wonder if they didnt under size everything to make up for the TiN coating, but went too far and undersized it so much that the coating being added didnt add enough material to bring it into spec.

[@sainttrilby7171]

I wondered the same thing. That still should have been caught in qc but it makes sense.

[@TRaider66]

Good point!

[@joemama.556]

exactly what I thought. probably a result of a cheap coat job, they would have been much better investing on a better and thinner coating(probably more expensive)

[@bradjones2480]

I am in high precision mfg. That coating should be microns thick, and at the most .001". That is no excuse.

[@TRaider66]

@@bradjones2480 with it being on high wear parts, could they have ordered a thicker finish? Like with 24k gold, Magnum Research stopped offering it due to wear issues. You can have shops do much thicker coatings. The fact that all of the specs seem to be off the same amount in the same direction is what has me wondering.

[@peppergrowmienola4850]

This was just awesome. A very informative 18 minutes of content. Thank you for taking the time to explain this stuff. I learned more about my rifle here than I have in the majority of my research. Well done. 👍

[@robertparker2420]

I remember learning a lot of cool things from you about how to take care of my AR when I frequented a certain shooter board. I have since moved to a free(er) state and this video popped up in my FB feed. I am happy to have found SOTAR again. Liked and subbed

[@TS-mq1fj]

Learned more in 18min here than years of shop talk from pseudo experts. Thank You very doing this!

[@mrcbrrr7484]

What an excellent thorough video .. thanks for doing this and yes! this is very educational.. shooting your rifle is great and fun but understanding the mechanism and why it works or fails is truly interesting for minds that are mechanically inclined like myself and others out there 🤙🏽🤙🏽🤙🏽

[@mtnbound2764]

these videos are absolutely fascinating. ive been building ar's for years now and just knew enough to get by, this is like a whole new level of understanding.

[@JoseDiaz-iq4rf]

This was very educational. Thank you so much!

[@semlohde1]

This is fantastic! I have never even imagined such measurements would be off like you are showing. Thanks for such details.. Subscribed

[@elbryan9]

Love these videos. Even though I've binged watched nearly every video, I feel like I keep learning something new every time. People keep sending these bcg's to you for inspection. How do I go about doing that? I have a couple bcg's you might be interested in taking a look at.

[@charlesevenstad]

This content, expertise and attention to detail is, frankly, mind blowing! The best part? Most people who watch this will never spend the time and attention required to exercise the methods you are so generously sharing with the world!! You will always be in a position to provide for you and yours financially!

[@thatrealba]

That cutaway is awesome! Many thanks to your wife!

[@chadh3441]

What a detailed and informative guide to , not only the troubleshooting, but the segmented descriptions that you added to describe what each part's function is in relation to the entire bolt carrier group. This is why I enjoy your videos so much, you are detailed and to the point with no bullshit. It's either right or it's wrong. Thanks again for another kickass video of important information! I'm sure someone else has already probably asked about your gauge kits and if they are for sale,so I'll just leave it here. lol. Thank a million man, keep up the great work, I do appreciate it!

[@Moneypit_Adventures]

I just came across this channel and I love the videos. Do you happen to have a list of the tools you used in this video? I'm always looking to expand my knowledge and ability when it comes to building and maintaining my firearms.

[@johnwesley8327]

These are the best and most educational videos. Well done.

[@keithweiss7899]

I remember years ago a NASCAR driver and mechanic told me not to waste money on fancy junk. Stick with the proven equipment and you’ll be better off. When I asked him why his car had foo-foo stuff like the fancy valve covers and fancy differential cover he said it was simple, they were free if he put them on his car and after a season of use he could sell them for big money to fans who wanted to brag that they had a NASCAR part on their cars!🤣

[@davidbarnett7145]

Thanks for the great review. I learned a lot. The test gages don't lie. This BCG is clearly out of specification. I can only guess how this part made it's way into the USA 🇺🇸

[@glenpaul3606]

Excellent informational video. You are obviously very knowledgeable on this platform and have numerous gauges and tools to do the testing. How would an average person be able to determine if the BCG on their new AR15 was within spec?

[@chevysevery3461]

Bring it to a knowledgeable competent gunsmith or purchase all the correct gauges you spend money either way.

[@jimklemens5018]

You can check a lot of things with calipers.

[@sydecarnutz972]

Thanks for giving us such a great understanding of how the dynamics work in this piece!

[@ChristianGrest]

Really cool! Thanks for going through this BCG in such detail. Hard to believe there's BCGs floating around that are this bad, but then here you are with an example. Always good to purchase quality components from reputable sources. Question...do you plan on an autopsy of the new Aero Pro BCG they just announced?

[@joshuahoward9642]

Probably one of those subscription box toys. This is the first example I really saw of the "don't just throw parts together, just because it's an AR part doesn't mean it will work together" except this just won't work with any parts. Really insightful video.

[@musician445]

Good golly miss molly. (Yep I just momentarily aged 60 years but i'm okay with that.) Its almost satisfying to find stuff like that isn't it? Makes you feel like, yes this gauging most definitely means something. I mean it sucks that some companies put stuff out like that, even if it was just an oversight, and it sucks for the customer too. But having a bit of validation proves the gauging method and makes it worth while i would think. Thanks Chad and Donna!

[@hardlylivin6602]

Due to the amount of failures on this bolt and BCG, I'm guessing this is the normal spec for whatever company made these. Moral of the story is never buy knock off carriers and bolts.

[@brandonjohnson3120]

Thank you for this. I have a bolt carrier group that just all of a sudden stopped cycling in any of my rifles. Swapped in a different 223/556 Bcg and it works flawlessly. Now I know a few things to inspect.

[@throngcleaver]

Gesundheit! Thanks for a very informative video. Can't believe I hadn't seen any of your videos yet, but now that I have, I'm subscribed. Where can I find the dimensions for the components of a standard BCG?

[@TheStowAway594]

Dang thanks for the information! You teach well, with examples (whiteboard & cutaway) and what issues a will result from under/over sized parts. I found it very clear and easy to understand, so thank you.

[@G5Hohn]

With no markings it’s almost certain that the “made in USA” is a lie

[@LuvBorderCollies]

I'd put money on it. Its font size and position is trying to give it legitimacy and probably a camouflage for it true origin.

[@kathima6459]

Thank you for the wonderful content. I am stuck at home with covid-19 and this video popped up, so I'm currently watching through your content. Thank you very much!

[@CoryHobbs2178]

Holy cow man, can we call this BCG The Perfect Storm™️

[@PalKrammer]

Impressive analysis. Highly professional. Thank you for making these videos.

[@theunofficialresults231]

Looks like they thought the coating was going to add thickness to the dimensions. Should have had that figured out, if that was the thought process.

[@heretohear8662]

Was thinking the same thing!

[@talonbaldwin8931]

Maybe they switched from hard coat to regular anodizing but that still doesn't account for all of the tolerance.

[@theunofficialresults231]

@@talonbaldwin8931 Yeah, who knows for sure, just seems weird every tolerance is oversized rather than mixed tolerance problems.

[@jamescole8049]

It’s your channel that makes my friends think I’m smart. 😂 learned so much from watching.

[@LionidasL10]

Maybe 2/14 etched on the side is the fraction of gauges this BCG will pass successfully.

[@MichaelPetty]

Very glad you showed that cutaway description, that helped my understanding of the function immensely. Watching a video of a very poorly made BCG was probably more helpful knowledge wise than a good one. Please keep making videos like this. :)

[@g.4279]

You have to ask the owner the brand of that BCG! Name and shame!

[@59232]

I subscribed in the first two minutes. Actually learned something new. Edit: this whole channel is gold

[@rshinn8776]

Does anyone know the manufacturer?

[@chriskellas2902]

What a great video, I learned so much more about how the BCG operates, and gauges I never new existed.... Thanks!

[@joshuaduff8588]

Two measurements that weren’t taken were bolt face depth and the lug thickness. Otherwise it was a very informative video.

[@trenvan5546]

do you think that useful as it failed to headspace properly?

[@destructableengineered146]

Love the mitutoyo calipers and digital mics. Same ones I bought and lasted me years in the machine shop. That cut away really did help. I mostly have my hands on 9mm and 45 ARs. Never built a 556 bolt from ground up. This explanation was great and detailed with that cut away.

[@boss350z5]

Given the excessive firing pin protrusion, would there be an increase likelihood of slam fire when the bolt is closed?

[@oldscratch3535]

That has more to do with the mass of the firing pin. The mass hasn't changed, so I would say no. It does increase the chances of a pierced primer.

[@boss350z5]

@@oldscratch3535 makes sense.

[@michael_notMike_stillman]

Masterclass on Bolt and BCG!! Well done sir!!!

[@armabearo]

That looks like right to bear bcg. They don't mark their bcgs though I could be wrong

[@DonD2001]

I don’t even own a AR but I love watching these trouble shooting videos. You do such a great job of explaining everything. I am a new subscriber.

[@kelon32]

Excellent video, but I am surprised you did not mention the worst failure of the carrier. The color of that coating doesn't match anything!

[@stevencoffmanii4171]

Love this channel.. you don't need to apologize for any thing. You are greatly appreciated