KAC SR-15 MOD2 PHYSICAL

KAC SR-15 MOD2 PHYSICAL

[@jackjmaheriii]

The “upper receiver illuminator tool” joke was a bit of a dad joke but I’ve got to admit, it did make me chuckle.

[@Lulzmango]

I didn't know the KAC rifles were so different in their components! Fascinating to see.

[@JohnBrowningsGhost]

Best AR money can buy, and it take a lot of money lol

[@carlreeves6108]

@@JohnBrowningsGhost I’d say it and lmt are a tie, lmt beats it in some areas and kac takes some areas. Phenomenal weapons

[@Richardjohnson6969]

@@brighthought11 no.

[@otetechie]

@@brighthought11 lol, no.

[@cadeinscho6339]

@@carlreeves6108 I agree to a point. I own both LMT Mars L and SR 15 16" & 14.5" I made my KAC's fully ambi with Redi-catch from Redo-mag. Now they operate like my Radian ADAC Lower. LMT is a little heavier up front with the piston. SR15's are my favorite to shoot. I also really like my SOLGW x Geissele 13.7" upper they just collaborated on. Got I have a serious illness. I am sure my wife would have us in a much larger home by now, if it weren't for my pesky addiction.

[@superfamilyallosauridae6505]

at first I was like "why hide the serial number? that's silly" and then I realized this is probably a customer's rifle, so mad respect for that

[@sackychin6267]

@@richardturk7162 or the customer doesn’t want anyone to know it’s his

[@superfamilyallosauridae6505]

@@richardturk7162 there's basically just no need to let people find out more information about you than necessary (none) for free. that's about it.

[@DJG37S]

@@richardturk7162 You clearly haven't been in the industry long enough. People hide serial numbers so that people like you can't call police and report it stolen. I'm an FFL 07/SOT 2 and I had a customer before who had to prove to the ATF and police that a firearm he owned was rightfully his. Apparently he posted a picture of his firearm with a serial number on facebook who and some one reported his firearm stolen.

[@DJG37S]

@@maxiomaxiom6169 Proof is the picture you posted online. A criminal can use that picture and say it is his.

[@charlieghague]

I learn new things everytime I watch a SOTAR video. Thanks for all the great content!

[@Strawman333]

Me too. SOTAR is amazing!

[@chipsterb4946]

I learn something from every one of your videos. This time the spring over buffer test and BCG into buffer tube tests were new to me. Thanks.

[@abolishtheatfandrepealthen6014]

Waking up to sotar vids is one of my favorite things to go with my coffee👌👌

[@AudiKayder]

I didn't even realize that Aero Precision explicitly references you in their description of the Pro series BCG

[@shan4pow172]

I cannot get enough of these videos. I am saving to buy or build a high end AR and these videos are very insightful.

[@THEZWARRIORWAR]

For KAC absolutely buy. Other high ends I would say also buy it’s less likely you will be able to put in the knowledge to match their techs and their QC. for example we would never be able to put a KAC together if we have all the parts and I don’t think they sell the tools to just anyone

[@ericshurtz4901]

Just wanted to say thank you for all that you do and all the information and all the time that you take to explain things your channel is amazing and so are you. I have learned so much from watching your videos and listening to your knowledge.We appreciate you very much thank you hope you have a Happy New Year and God bless you and yours.

[@tritech]

I'd really like to see what that gas block setup looks like.

[@sackychin6267]

Check out small arms solutions videos

[@THEZWARRIORWAR]

I own 3 KACs... and I don’t know either haha

[@GolfRemoEchoGolf2]

Back in the day when I was running some of KA stuff I never really paid much attention, now I'm a nobody again I think back and everything KA made was top notch..just trying to get a BCG and drop in rail took a few months lol

[@GolfRemoEchoGolf2]

@@0WickedSensation0 I have 2 pre ban Bushmasters and an original 177 upper , I was going do a Clone lower but it's on a Spikes lower now

[@musician445]

The bolt lugs and narrowed cam pin diameter seem to be some of the most desirable benefits. But ole Garland Plumb mentioned reports of people testing KAC barrels to 20k and still getting MOA accuracy out of them. Naturally i'm sure some barrels may not reach that bar. Depending on how repeatable that is from all KAC barrels, i'd say thats probably another very desirable trait.

[@DBravo29er]

KAC uses CHF barrels, but they stress relieve (word is, deep-soak cryo.... -320F or colder) after the CHF process, then hand lap before hard chrome, then they have a proprietary process for hard chrome application, then they hand lap AFTER chrome lining as well. My SR15 mod2 is silly accurate with all ammo. More than my 6920 and equal to my Sionics.

[@enb3810]

​@@DBravo29er I appreciate the info. No disrespect but I definitely wouldn't expect the colt to compare. They might be the OGs but I feel they're overrated now.

[@DBravo29er]

@@enb3810 None taken. My 6920's are from 2012. Colt has gone downhill recently.

[@coachingaddiction9756]

I loved this video. I'm so into this stuff. I have a lot of amateur fun smithing tools but I want to get some professional ones like you have. Thanks man

[@jakemerica]

I wasn't aware how proprietary KACs really were. Surprised my Midwest Reaction rod wouldn't work, but I understand why now. Great info. Thanks SOTAR.

[@Eroc556]

I absolutely love my Knights….. I have a SR-15 and one SR-25……. These both are my go to for anything, they are works of art!

[@ashhess535]

Great video. I would note that the firing pin is also different. Bolt, cam pin, and firing pin. Carrier is standard. You may have said it and I missed it.

[@ThaHerbanLegend]

He mentioned it

[@rednew8222]

Keep doing great things Ash and team 🤘👍

[@Lvoa-C]

He pretty much said that word for word

[@hmsrentals]

Thanks for the video. Love my KACs

[@ASVABWAIVER11B]

I absolutely love that I found this channel. Thank you for the amazing knowledge.

[@user-vf1tb5dm1h]

KAC has a really tight fit between lower receiver, end plate, and extension locking parts which allows them to get away without staking and also gives the stock perfect alignment. You can't get this with random parts thrown together from different manufacturers

[@dorianleclair7390]

Sons of liberty gun works have very tight upper and lower reciever fit as well. If it does not fit tight they reject them.

[@ShooterMcGottem]

*Me who has thrown together dozens of rifles with random parts and never staked a single castle nut* about that...

[@RaftGuidePhil]

You’re wrong about that. The castle nut and end plate KAC uses doesn’t allow for staking. It has nothing to do with fit.

[@rodiculous9464]

You don't really even need to stake it you can just loctite it. I know thats heresy for some AR fanboys but it works and some companies actually recommend it like for example the maxim pdw stock which eliminates the end plate and uses a separate housing that doesn't allow for staking

[@ShooterMcGottem]

@@rodiculous9464 you don't even need to do that.

[@CoryHobbs2178]

Thanks for doing a physical on this one! It was great to watch

[@ArturroWasky]

Thank you for the great video as always. I was wondering if you use any kind of inspection checklist to follow the steps in a specific order and not miss anything? It seems to me that such a list could be a useful tool and could also be a certificate or health check list for a particular rifle inspected.

[@patrickthompson389]

Great content. Regarding the KAC extractor groove clearance, would using a standard AR claw clearance gauge in the bolt while assembled suffice?

[@JG-nw3ub]

Excellent video illustrating kac’s e3 system. Most people overlook the st15’s features and chuck it off as just another ar15 lol

[@lm-usmc]

I have an older SR15 Mod 0 Legacy that is the smoothest shooting AR I've ever owned. I totally understand the higher price. Well worth it. KAC is doing it right.

[@DJG37S]

I have a KAC SR15 Mod 0 also, and for a $2500 rifle I expected it to have a better trigger, yet what I got was basically a milspec style trigger. Now this wasn't a big deal because I'm an FFL 07/ SOT 2 and I had trigger springs and hammer springs in spare parts where it will lighten the pull between 3 - 3.5 pounds where I can switch it out, but once again for a rifle that cost about $2500 it should come better trigger.

[@Richardjohnson6969]

@@DJG37S should have gotten a mod 1/2.

[@rogermurtaugh4766]

It's a combat rifle so it comes w a milspec weight trigger. Unless it's a long range rifle military rifles usually use single stage 5.5lb triggers.

[@lm-usmc]

@@DJG37S Unless its a precision rifle, you do not need a 3# trigger for a combat rifle. It's unsafe. When these rifles were built you didn't have the abundance of aftermarket triggers for AR's that you do now.

[@rogermurtaugh4766]

@@lm-usmc you can always tell guys who nvr in the military bc they always complain about triggers. We learn to use what's available then we nvr hv to go waste 1000s on triggers.

[@code_red7744]

This channel should have 20x the amount of subs as it does… a wealth of knowledge on this channel!

[@denniscasey986]

Another Emmy award winner. Thank you.

[@baileyparadis1815]

Definitely interested in that buffer tube to lower fixture! Much better than me trying to guess/manhandle it!

[@callsignfancycat]

Same here!

[@kenbranson8641]

Great channel! Your knowledge, which no doubt an expert on this platform...amazing! Thank you! I was hoping you could answer a question, I'd like to know if polishing the bcg guide rails or the entire bcg has any benefits or does it hurt efficiency?

[@ffostraining219]

Great video, man I learned something new in the first minute. Keep up the great content.

[@ChristianGrest]

Some cool differences in this rifle.

[@MZ-nw7wz]

I learned more in this video in 30 minutes than in 30 other videos.

[@AsianWithHat]

Awesome video Chad! Much appreciated.

[@crypticplayzzz271]

Good disclaimers on proprietary tools. 👍

[@DistrictSoundLab]

Wow pretty cool design tweaks

[@ross8270]

What’s the proper carrier key to lower clearance if using an a2 buffer tube assembly?

[@notachannel5476]

hey i just watched your video on making your own gun oil i did it and love the results but the geese smell like crap when you shoot it on your gun i was wondering if you could recommend anything i could add to cover up the smell i didnt want to just spray the bottle of oil with Febreze just to find out that Febreze has a chemical in it that would rust the gun or something

[@johnh4957]

I'd love to see description of borescope variations among different barrel types ie: button rifled, cold hammer forged,cut,etc

[@mindyvansickle3527]

You sir are wealth of knowledge

[@warsword2538]

I have a 2021 M&P Sport 55.6 with magpul flip up sights. What type of issues should I look out for ?

[@NoWr2Run]

GREAT VID. AS ALWAYS, very well explained & I'm impressed on the improvements Knights made on this rifle. But they do charge you for it & I really can't argue about the price but I want to, LOL.

[@williamboggs1682]

Really enjoy your videos thanks

[@TheFlea1987]

This video made me want to purchase a Knights. Guess it's going on my list to buy.

[@tajituck888]

Hey. I have question. My Bolt carrier gas key has a slight leakage in two spots. The gas key is not lose whatsoever and it’s properly staked perfectly. I have 875 rounds through it to be exact. I’ve had no malfunctions at all with 3 to 330 ejection pattern. Like I said before it even runs Tula ammo. Is this something I should be concerned about? Should I get it looked at and replace the gas key or should I just get a whole new BCG all together?

[@stephensirabella4054]

Great Physical ! Thank you

[@zacknicholson3693]

I would love to see a physical and your opinion of the new Aero Precision Pro series BCG.

[@jonathansmith7306]

This rifle looks almost as proprietary as a 416. At least they are innovating a bit. I'm surprised Knights doesn't use something like the Surefire enhanced bolt carrier. For the price they might as well

[@RandyTheB_]

Jim Sullivan is doing his own thing with well, surefire. Eugene worked for knights.

[@JG-nw3ub]

There’s no need for a Surefire enhanced carrier when kac’s system is already enhanced. It’s part of the price tag. Most other co with ridiculous price tags can’t say the same.

[@bwayne4039]

What gauge was used to determine carrier travel? What is the correct spacing size (gap) between BCG and lower receiver? Looks close to 1/4 inch. Thank you for any help

[@SuperSecretSquirell]

My SR25 castle nut wasn't staked, but had a lot of Loctite in it. I'd imagine they do the same on the SR15/16.

[@208miuwu]

Always professional good videos

[@paulcartmel1373]

I know this isn’t the video on it, but I love the video on the centurion sand cutter rails. I have to take your class!

[@weshamburg8611]

what brand are the gauges you use for the bcg physicals?

[@oxencott3n175]

Great Great video like usual. I would quit my job and move to Maryland to work with SOTAR

[@ronin_5.453]

I know the e3 bolt is proprietary to the sr15/16 barrel extension but is the carrier a standard milspec and can it be swapped for another route a forward controls bcg that is more gas efficient?

[@DrPosion]

Can I ask what brand, or where, those gauges are from?

[@dorianleclair7390]

I bet that knights reaction rod was not cheap.

[@bpfinlay]

Do you have a video explaining why you check for magnetism? If not, could you explain and what factors could produce it?

[@Moderndaycowboy74]

Anything magnetic can gather debris from steel cased ammo. During the magnetic particle inspection things can get magnetized

[@platinumcontent9]

Dang man.. incredible how you know all this stuff. Do you have any business in Georgia? Like can you upgrade rifles at your shop? and would love to see a review on Stag 15 rifles

[@Brandon-youtube]

I’m curious, is grime on the sword handle portion of the firing pin possibly indicate gas leaking through the bolt tail bore?

[@donaldbetts6480]

I don't think so it seems like they all get it there

[@jsotelo5150]

I just wish you could still buy Knight Sticks. Also looking forward to an aftermarket option for extractor springs, I would like some extras.

[@MrWilk_Firearms]

Very excited about this one.,

[@EarthAltar]

Awesome video. Thanks!

[@koosh2001]

where do you get your go- no go gauges? i wanted to get a few of the essential ones

[@brianfhorton]

He custom makes them himself. He sells limited runs of them but only to alumni of his classes. Take a SOTAR class and you can purchase these custom gauges.

[@tom77685]

Where could I find the gauges for a bolt carrier group that you have on the table on that white block?

[@ExtremeUnction1988]

“It’s gotta go in all the way or it doesn’t count.” 😏

[@My12521252]

I've got a good gun puzzle for you if you would mind thinking about it.. I loaded up a mark 262 clone for a PRI Mark 12 upper. The rounds are chambering tightly with many not wanting to go fully into battery with a difficult extraction. The loaded bullets pass a Wilson case gauge. The PRI upper passes a MIN go gauge. The bullets chamber perfectly in 7 other uppers I've tried except the PRI MK12. The PRI upper also has a problem with about 20% of factory loaded ammo. The brass I've reloaded is once fired British RORG. Also tried some federal, LC, PMC and Winchester. All the cases have been annealed. MK262 clone Rem 7-1/2 BR Accurate 2520 25gn 77SMK HPBT 2768fps 2.246 OAL Trim 1.755 Bullet comparator 1.856. Also this PRI upper is unfired. Thanks! Nate

[@My12521252]

@@ChrisReparationslul it passes a min headspace guage though.. I did use some Sharpe on a round to see where its contacting and it gets full contact on the shoulder with a brite spot about the size of the tip of a ballpoint pen just aft of the shoulder making me think there is a protrusion that was missed when the chamber was cut. I'm not sure how that could be thought because the reamer is turned in the chamber so if the reamer was broken or missing a tooth, there should be a ring that wasn't cut not just a small protrusion. I have 2 of these uppers and the protrusion is in the same place on both uppers, which are most likely from the same lot of barrels as they where built at the same time from pri

[@sladeoriginal]

Have you ever thought about working with quality, no frills manufactuers for specific SOTAR tools or AR components? I think you worked with FCD on a cam pin right? Correct me if Im wrong

[@brandonsidwell7497]

Could you do a review on the. Aero precision pro series bcg

[@richardmueller7023]

Awesome video!

[@shadyburnz12]

Awesome thanks

[@BestPetClips1]

Great video

[@icantdrive75]

Why wouldn't you be able to use the URR? The receiver extention can accept a milspec bolt so it stands to reason it would be able accept the URR. I bring it up because I almost always use the URRs on KAC muzzle device removals and if there's a reason I should stop I'd love to know!

[@JG-nw3ub]

It’d be interesting to see sotar look down an Lmt/mrp barrel to check their 45 degree gas port throat erosion

[@musician445]

LMT does 45 degree gas ports? I recently heard about the company Special Ops Tactical who makes the Siphon AGP barrels in 14.5 and 16" rifle length gas systems. I'd be interested to see what its gas port erosion looks like too. As well as if it actually does anything?

[@cbremer83]

Seems like you mostly get new stuff in pretty good shape or factory defects. At least in the videos. Would be nice to see what some of the heavily worn stuff looks like that has hand a few thousand rounds or more through it.

[@omarcintron1289]

Great video, i am need of some instructions on where i can replace my KAC SR 15 Carrier Key ? I dropped the BCG and now the Carrier key is visibly bent and wont seat properly. Any ideas on what brand of Carrier key and screws , cannot find any Sandcutter and or anything from KAC ..

[@RaftGuidePhil]

So your rifle is down because you dropped your BCG ?

[@omarcintron1289]

@@RaftGuidePhil yeah the gas key tube landed right on the floor and bent it out of spec. The bcg will go into battery but will not retract using charging handle because of the I’ll fit of the gas tube. No worries KAC sent a new bolt and now gtg.

[@jimmyfaherty8588]

so, if everything on nights armament is proprietary and will not fit other AR's. doesn't that make it problem? so it's an AR 15.1? just asking

[@gunsandgaragegear601]

Where do you get that buffer tube to grip alignment tool? Edit at 29:05 he says he has no clue when it’ll be available. Dang

[@ThePatriotParadox]

Makes me want to work for KAC.... Plus possibly own an SR-15...lol #nicemachining

[@ssamuelt79]

Good stuff!

[@Belford_4642]

Can you explain why you check for magnetism on the components and why it’s bad if they are magnetized?

[@ThaHerbanLegend]

Won’t impact function or cycling but if you run steel cased ammo or bimetal projectiles then the shavings from those can get attracted by the magnetic parts and can cause excess wear or a malfunction

[@animalmother556x45]

@@ThaHerbanLegend Also, there can be particles of ferrous materials all over the place. Shooting near the ground, getting the gun dirt, etc, can pick up tiny particles.

[@mynameajeff226]

Could you address fixes for upper/lower gap and wiggle?

[@jasonsutton6193]

What a great video. The feed ramps on my KAC mod 2 have what looks like a little rust on them, an orangish color but I attempted to clean in it and it’s definitely not rust. Do I need to be concerned?

[@armorers_wrench]

I'd love to have one of their 11.5s with a suppressor but unfortunately right now I just can't justify the price. All in with an optic, high end lower, light, kac upper, and a suppressor you end up with like a $5k gun.

[@muddyhotdog4103]

Wish we got a bore scope image of the carrier inner finish

[@dakine808shooter]

Can u do a physical of a LWRC DI bolt ? I subbed to your channel. I've learned so much . Need me some tools now hahaha

[@johnmcgargill2260]

where can I find a knight stick though sir. I really want to put my suppressor on my 14.5. when you look at the tool lugs on the knights there's no rounded edges so what gives, oh and I can't find o e anywhere, I don't think any lgs have the appropriate tool besides not trusting them to not ruin my rifle...

[@TheDrunkLibertarian]

We out here early

[@jamesmoore3690]

Do you have a list of all your gauge dimensions

[@marktwo3160]

Is there a safe and reasonable way to demagnetize a bolt carrier and it's components without buying an expensive degausser/demagnetizing device? There are No legit gunsmiths in my area. No machine shops either.

[@brianleabo6295]

Are the parts able to be switched to stander guns ? I would think not

[@Puppetmaster305]

Where can I get those go/no go gauges?

[@billymichaels2889]

Now I want a Knights Gun cause I can buy more tools hahaha AND an upper receiver illumination device is on my list 😂

[@NoBrakes23]

I doubt I'll ever drop the coin for a KAC, but good to know about the different reaction rod. The multi use design is clever.

[@5jjt]

I wonder how many gauges would be owned if Chad went the AK route.

[@matthewstevens5574]

If a Knights bolt were to break could you run a regular bolt in it or will it break?

[@otetechie]

The manual says you can run a regular bolt in an emergency.

[@raydionisio274]

Good luck breaking one. I think there has been 1 broken one I've ever heard of happening, and it was due to a KB.

[@joelhenry7546]

I would like to see a mk18 physical

[@CoryHobbs2178]

I was wondering if the cam pin Is less diameter, have you ever seen one of those break?

[@android61242]

There is essentially no way that could break unless the material itself was severely defective and I have never even heard of a defect of that nature occurring in bar stock.

[@CoryHobbs2178]

@@android61242 I was curious because I know it's not uncommon for TDP cam pins to break and they are thicker

[@DD-hz3ts]

@@CoryHobbs2178 the cam pin isn't the part that typically breaks, it's the bolt itself

[@5jjt]

What would you choose... 1. Very gas efficient carrier w/ a quality bolt. Or, 2. A slightly inefficient carrier w/ an indestructible bolt?

[@jamesp6282]

First off the KAC SR15 is a master peace of a rifle. Period worth the money if you can afford it. Second people cover serial numbers because criminals will make a counter fit gun and copy your serial on it to help avoid that cover that up

[@RaftGuidePhil]

Are you speaking English ?

[@RandyTheB_]

People bemoaning the changes Knights (and Eugene) implemented in the SR rifles always get me because "milspec" AR dimensions are very long in the tooth for a weapon system. Do they also complain about Sullivan's work at surefire with proprietary parts?

[@timbattle3415]

Will the Knights bolt only fit with their proprietary barrels or can I run this bolt in a chamber cut for square lugs? Thanks

[@muddyhotdog4103]

Proprietary