2 JP FMOS BCG Physicals

[@Snowy0123]

I've been binge watching sotar channel for a couple days now,, really the best ar channel out there.

[@Brettmlyons]

No one else compares.

[@shnewsky6982]

I really appreciate these videos. As well as how in depth of detail you go every single video, which is especially friendly towards new viewers. You not only reiterate the details, but you always explain WHY and it helps with absorption of the information. Thank you! And damn those JP BCG's are nice as hell. Might have to pick one up.

[@B3ASTBALLISTICS]

Another fantastic video! I have three JP BCG’s and two of them are in what I would considered to be top tier duty rifles, the other is in a JP 6.5 Grendel.

[@dhsu04]

Have you tried Lantac's BCG? How does it compare to JP's?

[@B3ASTBALLISTICS]

@@dhsu04 I have a brand new Lantac E-BCG that I keep as a backup BCG. Unfortunately I have not shot it yet, so I can’t speak to that, but I can speak to the fit and finish of it and it is not as nice as my JP BCGs

[@ssharma1384]

Very late reply but Lantac is hot garbage , nothing enhanced about it except the price .

[@ForceRecon112]

@@ssharma1384 only thing enhanced is the tail of the carrier for non existent carrier tilt that ive yet to see happen anyway and their weird cam pin geometry that doesnt do much. Saw a few of their bolts have sheared lugs recently. Never seen that on a jp or lmt bolt

[@coopers1716]

I got the JP Low Mass BC and then stuck a 3-ring American Built Arms bolt in it and the thing operates beautifully. Stands up to the bolt-weight test, too.

[@mattofjax]

I watched a video today about JP Enterprises bolt and the one piece spiral ring, and the wave designed it that has less friction and more gas retention and they say they last four times longer, but they are designed intentionally in a manner that will not hold the weight of the bolt carrier

[@coopers1716]

@@mattofjax I decided that while I trust JP a lot, I don't want to deal with all sorts of weird dwell timing stuff I didn't understand and stuck with the basics. Also my build was starting to exceed my estimated budget like a contractor a year into a project. 😆

[@Tom-qx5nl]

I'm addicted to your channel! Best AR info I've ever seen!

[@joelclark2130]

I love it ,absolutely the best AR Channel out there. I Am hand loader, now a lot of things make more sense. Thank you very much again greatly appreciated

[@frankiejankis]

How am I just finding this channel and why are there only 10k subs!?!

[@mr.excitement689]

You should see where he came from a few months back at like 3-4K subs. This channels blowing up dude

[@frankiejankis]

@@mr.excitement689 Yeah I noticed them rising pretty quick. I am glad I got in on his Facebook page before they stopped accepting new members.

[@SS-tr5ru]

JP is awesome

[@opmike343]

The bcgs are QPQ/Melonite/Nitride over 416 stainless. Bolts are, as you say, 9310.

[@alouiciousjackson5812]

Thank you- you're the first person I've ever heard say that you prefer either the insert or the o-ring. I always remove the damn o-ring!

[@cyclepath55555]

"It only counts if it goes in all the way"

[@sferrell1987]

Tell my children that.😐

[@lindyterao1888]

LMFAO!!!!

[@CopyCatGarage]

I really have learned a lot from your videos. I wish I had the resources to attend your classes.

[@SAR0311]

I am commenting this, as it is currently the latest video in your channel video library, to say I am glad I somehow finally stumbled across your channel. I would love to get some time to go to Maryland and take both your courses someday.

[@honestguy6345]

I recently found your channel and I truly appreciate your knowledge and thorough explanations. Would you consider doing a video on how to professionally stake a castle nut?

[@NateDizity1420]

I have this bolt and JP now lists these as 223 & 556. I also checked with JP before purchasing and they told me this bolt is made for both 223 & 556

[@ForceRecon112]

Thinking about picking one of these up for a comp ar-10 in the near future. Al with classified defense will be swapping the springs to sprinco and swapping the gas key and securing it with OCKS. That is going to be an F1 race car bcg

[@darwinner007]

I've been waiting for this! Excellent video!

[@evanknight5818]

Hi, thank you for your very helpful videos. Can you explain more on the reason you do not prefer both the insert and o-ring to be installed on the extractor. What are the negative issues with having both installed. Thank you for your time and help.

[@CarRacerGVR4]

I shoot 3gun and I only run XM193 through my gun for my short range (inside of 200 yards) ammo. This is *extremely* common for competition shooters.

[@CoryHobbs2178]

I'm hooked on this channel, where can I buy your gauges?

[@timturner7609]

Brownells sells most if not all of the gauges he uses in these videos

[@mr.excitement689]

Lots of his gauges he crafts himself. I looked and you really can’t find a lot of them.

[@SpyStaMia]

The head gauges are custom made and they don’t seem to be available for SOTAR, so I’m stuck removing the extraction pin ...

[@OuijaSTi]

You'd probably need to approach a machine shop with a surface grinder and cylindrical grinders to produce some of these to very close tolerances.

[@ghodge82]

What’s the top BCG you can think of now in 2021, the best made, longest lasting BCG?

[@ghodge82]

@@brighthought11 I also am interested to see the replies if any

[@kalliste23]

There's a school of thought that the gas blowing into the receiver on an AR helps clear out crud and water, what are SOTAR's thoughts on that? Is it valuable thing to let a bit of gas blow into the action?

[@LM-mc2lm]

Chad, thank you for the videos! Based on your opinion would you choose bravo company (bcm) enhanced bcg over a sharps xtreme enhanced(SRC) bcg?

[@stiles3711]

JP does their 1 piece ring different than the old school McFarland ring that was sold by armalite 2.0. The do a grinding operation on it to set the od. The old McFarland ring had a ton of tension to the point of not functioning. Not saying it's better or worse than the original 3 ring design, just saying it's different than the old McFarland ring. A lot of JP guns and bolts are run with hot handloads in matches with longer range stages. Ohhh, this is an interesting aside. Jim Sullivan has a patent pending on a 2 piece zero gap gas ring for the AR. It is part of a huge patent which includes stuff like a quick change barrel system and a lot of cooling ideas for the gas tube. The whole concept is to make the AR into a SAW with the surefire mags that he patented so a SAW would be a walking machine gun and not crew fed. Search Armwest LLC and Leroy James Sullivan on google patents and you will find it. Inrange TV has some interviews with Jim about some of his concepts he was or still is developing.

[@richardlee4438]

Instructor Chad can you do a video on upper and lower receiver fit? And what to do if the take take down pins are extremely hard to get it and out?

[@Throndl]

Love the bolt support block.

[@555Pleiades]

Thank you for the great content! Do you have any videos showing how best to measure if the buffer retaining pin hole is too far back and the barrel is too far forward? What datum to use? Hope that makes sense.

[@Orr_s]

What gas rings would you recommend if you were going to order just rings to replace? Brand name and so on...i saw in another video you mentioned spring co for ejector springs...will probably upgrade to one of those when my new Aim TiN bcg comes in. Thanks!

[@flea4theLord]

Outstanding sir.

[@Invitingsauce]

With all the beat up and abused guns you have seen/see. All the oils/lubs/greases out there. What have you seen that works well. What Lubricant do you recommend. What to stay away from. What makes a lapping compound, and what makes a good oil.

[@AKMoffat]

He has spoken about Cherry Balmz in the past and many of his students/followers utilize it as well. In regards to education on the topic, crack open a cold one and read all the 'why' on the Cherry Balmz website as to what oil is, what grease is, and how it is best utilized in these rifles.

[@rhino67]

Chad as usual, excellent video. Question, can we order either a complete set or by the gauge of your AR gauges? If its possible to get a list with pricing that would be awesome my good man, thank you for all you do...btw love what youre doing on the rifle reviews starting with those who dont permit regular people from attending their armorer's course.

[@cascadesexplorer]

Instructor Chad you mentioned that you do not prefer using the extractor spring insert in conjunction with the black oring. Can you please elaborate more this and why you choose one over the other? Thanks for all of the great info!

[@the808speedshop]

awesome work

[@dbmail545]

Do you think the one-piece gas rings are OK if they are tight to the BC? The only guns that I have put them in have passed the ring test with flying colors.

[@Jallandhara]

Why would they call it full mass if it's a non-m16 bolt carrier?

[@JohnBrowningsGhost]

Because it weighs the same?

[@dawey8144]

Chad, I'm sure you've explained in another video but why do you not like see both the extractor insert and the o-ring? Thanks in advance!

[@jaysmith9496]

I know this is years later, but I run my JP rifle at 70k psi with 77gr smks going 2900 out of an 18”.

[@Rickjames127]

Can you please do a physical on a white label armory nitride bcg?

[@everythingphil9376]

Nice channel. Can you do a physical on the Brownells chrome 5.56 BCG?

[@lentinikhalsa1]

Thanks for your work chad

[@pascalhumphrey]

Can you show some videos of you fixing the weapon

[@guychin9720]

When you check headspace, I noticed you do not remove the ejector? Is this correct? love your informative videos !!

[@R3AP3R4M]

the gauge is cut for the ejector

[@bidenisatraitor7633]

Why do they put o- rings in the bolt if they do not need them? What purpose does the o- ring serve?

[@Orr_s]

Can you switch to just an insert and no o-ring if your bolt and extractor from the factory comes with an insert and o-ring? Will that effect any sort of function due to how its sent from factory, or could only possibly improve function if you did so

[@iwreklives3374]

Inspector chad can you let me know if I should be worried about a blemish aero fde upper receiver, the inside is finished like the outside except it does not have a smooth finish like the outside. I tested my other uppers none our fde, but all my uppers have a smooth finish inside. Will my aero upper in fde be a problem because of the finish inside?

[@perlenbacher6788]

As a mechanic Id imagine you wouldnt want one piece gas rings for the same reason you wouldnt want one piece pistong rings on a pistonhead in a motor? Bad seal since they doesnt expand?

[@PrestigexBullet]

Why don’t you use a NO GO Gauge during the headspace check? I saw you use the GO Gauge and the Field Gauge. Why not the NO GO Gauge?

[@Trilogy2112]

Have you seen a broken Aero Precision nitride bolt or are then generally reliable?

[@jonathonschram3429]

A guy had one break at a local 3 gun shoot. He's a handloader, and he was running a pretty hot load when he attended our long range course...so there's a chance he ran some heavy loads through his 3-gun rifle as well at some point. We broke one running full auto 300 blk suppressed as well. Odds are pretty good if you've seen a broken bolt, that it was an aero or psa. Not because their bad per-se...just the sheer volume of them that are out there in the wild. If 1 in 10,000 break under 20k rounds...you are still going to see more problems at the range than Gucci brand X that grenade 1 in 100 under 20k rounds. I've worked at a range long enough that I've seen just about everything go down at some point. I just remind myself when a glock, sig, or m&p go down that I see hundreds of them work flawlessly in class. Just because that 1 Hudson survived a high round count class doesn't mean it's more reliable necessarily...

[@DaedalEVE]

Could you make a list of the tools you use?

[@vlodpg]

Chad, Why are you not a fan on 1 pcs gas rings? Edit: Answered @ 2:10 & 22:55

[@99cobra2881]

Yup I added one pc gas rings to my rifle years ago but they failed the stand up test and I removed them.

[@SchooloftheAmericanRifle]

I made a video for AR Build Junkie about Gas Rings. It's on their KZbin channel.

[@vlodpg]

@@SchooloftheAmericanRifle TY, found it!

[@dons_xclusives3593]

Im building a 6mm arc ar15 what bcg do you recommend?

[@OntheToto]

What's the bad thing about the one peace gas rings?

[@Semiautoautomatic_shaman]

Can you replace the gas rings?

[@CaptGus]

I just got the JP enhanced 6.5 Grendel bolt, and I freaked out when it had no resistance going into the bolt Carrier and I called JP they said it was normal. But as in your video I see the bolt sticks it does not fall out the bolt Carrier. It fails the suspense test , on all 3 boat carriers, I’ll be using it with a rubber city armory bolt carrier I can’t test it because there’s no ammo to be found. Should I be concerned professor?

[@Oper8or]

I have a question that hopefully someone can answer on here. I just got the parts to replace my fore grip and i am wondering what should be used to lock the upper to a vice. Should i use a magazine block or a barrel rod? I've seen both used in videos but i dont want to mess the threading up on the upper.

[@Casualfield]

what foregrip requires you to vice an ar?

[@Casualfield]

@@jcnikoley Okay he meant forend. This terminology is awful.

[@Oper8or]

@@snek9353 i bought the real avid rod. the aluminum pin for the block already broke. I'll be ordering a reaction rod.

[@yoteoboth8449]

What did you do to your back?

[@mr.excitement689]

What’s pricing look like on these y’all?

[@mattkarau1195]

$3-400

[@Some_dude773]

I did a little research on these because I’m looking for a bolt carrier to replace my one I have in a 13.7 build I did and these are made from 416 r stainless. I know that for barrels stainless doesn’t have as long of a life and was wondering if it was a good steel for a general purpose bcg? Also if anyone has recommendations for general purpose gas efficient bcg I’m open to suggestion.

[@coopers1716]

The finishing matters far more than the material its made out of once you get into nitty gritty on steel specs like that. Likely you'll never put enough rounds through your rifle to eat through JP's coating as they're some of the best at what they do.

[@DB.KOOPER]

Whats the purpose of checking for magnetism?

[@DB.KOOPER]

@@itsamk18-ish Cheers. Thanks for the explanation. I never thought of that but I heard him address it in another video. Best to ya.

[@7_0_sav5]

What did this weight in at total?

[@ssharma1384]

FYI, The bolts are NOT HPT/MPI nor are they shot peened. So these are not for duty use, only competitions. I find for a BCG of nearly 400 usd that they should do much better than nitriding the carrier and dlc for the bolt . NP3 or hard chrome would be much better . The bolts are reasonably priced but 250 bucs for a ho-hum carrier is outrageous.

[@ssharma1384]

These are also semiautomatic carriers , 250 bucs for SA, yikes !

[@bl00d_farmer]

I have been getting failure to feed issues with my JP FMOS BCG. The BCG is the only variable in different rifles that causes the issues. I am at a loss as to how a high end BCG can suck so bad.

[@SchooloftheAmericanRifle]

Try 3 piece gas rings.

[@bl00d_farmer]

@@SchooloftheAmericanRifle swapped the gas rings. No longer short strokes, but failure to feed with rounds at a steep angle. Not gonna run that thing anymore. All other BCGs ran flawless.

[@bl00d_farmer]

Note, this is in 2 different uppers as well. Both uppers are complete uppers purchased directly from BCM. In no way did I do any work on either upper. All ammo is factory new brass ammo. I really cannot see any other variable other than the JP BCG being the problem. Emailed JP a few times, called, nothing back. 😔

[@jpowens2253]

@@bl00d_farmer it might be the mag you're using isn't presenting the round to the bcg correctly.

[@bl00d_farmer]

@@jpowens2253 I have ruled out mags.

[@dana2750]

Hi Chad thanks for the awesome videos. I’ve got a question for you, when your not using your Wheeler torque wrench do you lower the setting back down to 10 or do you go lower then 10?

[@cloudstrifens]

I have an obscure question; how deep is the pocket where the charging handle locks into supposed to be?

[@alexc5884]

Are yfs fastener bad or good? Asking for a friend

[@echofoxtrotwhiskey1595]

Horrible

[@SkintSNIPER262]

Can I send you my Colt Canada BCG for a Physical?

[@TheEricsheak]

Where did you pick up your gauges?

[@aquablaster86]

Most he makes himself, I believe. Some can be picked up at Brownells or Midway USA somewhere like that.

[@rilianriggs4620]

Ok, after watching several of your videos please disregard my stupid question about tools and gauges.

[@CharlieMikeNS]

Why are you not a fan of one-piece gas rings?

[@zacharyfernandez9944]

How much? is for all your op Topsy tools for AR15?

[@SchooloftheAmericanRifle]

I lost track but it's easily 20k

[@zacharyfernandez9944]

@@SchooloftheAmericanRifle is there a website where i can buy everything packaged all in one so that way i can buy it a one time shot can you send me the link?

[@SchooloftheAmericanRifle]

@@zacharyfernandez9944 I have a list on my Facebook page and my Facebook group that lists all the tools and gauges I use. At this time I don't offer gauges to the public, just to students. It's very labor intensive work and it's not profitable.

[@zacharyfernandez9944]

@@SchooloftheAmericanRifle how much is the borecam? And is there a newer model?

[@GevoA1]

Found you recently and love the details. One thing I find lacking in these physicals is the actual measurements of the bolts themselves in order to determine the sealing properties of the bolt system. I understand you sort of measure the tail of the bolt with gauges which we don't know the size of, and you measure the bolt body at the front, but I find this to be less extensive to the entire bore of the carrier as it lacks reference. Recommendation: For ease of understanding for the regular watcher, make additional corresponding gauges to match your bore gauges, including the color coded system. This will quickly tell which areas match and which don't. On a side note, I find poor sealing to cause excessive build up over the firing pin and/or the head of the bolt, indicating this issue with the BCG. Was wondering if there is an easy way of addressing this, short of drilling larger vent holes on the carrier. Thanks!

[@SchooloftheAmericanRifle]

I don't share all the dimensions, this the color coding. Some info I reserve for students. There is countless hours testing and troubleshooting behind some of the dimensions.

[@SchooloftheAmericanRifle]

The fouling you mention won't be a problem if the weapon is properly lubricated. If shot dry or lightly lubricated the fouling can cause failures at moderate to high round counts.

[@GevoA1]

@@SchooloftheAmericanRifle Thanks for the reply, I understand you need to maintain your info since you put in the work, that's why I thought maybe you can do all the measurements in colors vs only the main bore. And thanks for the side note, I do oil regularly and will keep that in mind. Cheers!

[@bloviatormaximus1766]

Melonite QPQ nitride whatever you want to call them no chrome

[@CaptainCiph3r]

I have seen one of their .308s fail due to gas bleeding out. Swapping the gas ring helped, but only swapping the BCG entirely to an Aero fixed the problem

[@MrTylero28]

First to comment love your work Chad!!

[@elitetrader5468]

I hate those single piece gas rings. They suck to install (easily damaged) and they are not worth the price.

[@MikeHunt-rw4gf]

Algorithm.