This is an autopsy of a Knights Armament Company Sandcutter AR BCG. The BCG wouldn't run and we're going to try and find out why.
Пікірлер: 114
@CoryHobbs21784 жыл бұрын
The amount of knowledge gained on this channel is insane
@ballcoachp3 жыл бұрын
Seriously dude!! Great stuff.
@ronaldluther3243 жыл бұрын
Two things I have learned watching this channel. This is the second time I've seen Knights bolt carrier's with loose fitment issues. The Giessllie Superduty bolt carrier past these very same test with an added comment about Giessllies results being good enough tobe used in competition. The Superduty could be the new top tier AR bolt carrier on the civilian market until someone creates something better. 🇺🇲✝️🇺🇲✝️🇺🇲
@dogshmog3 жыл бұрын
Agreed 100%. Especially considering they adhere to TDP spec and non-proprietary parts. During a livestream of their new products a few years back, I jokingly asked Bill about the wood table he had everything displayed on. It triggered his extreme attention to detail OCD, and he starting rambling about the type of wood, how it was made, blah blah blah. The point is, he knows details, and that is what makes their products so successful. I have only run LMT E-bcgs for a while, but I had one of these civilian Sandcutter carriers, and was not impressed with the QC. I'll be switching everything to the G REBCG's now, especially considering their price and availability.
@yhird3 жыл бұрын
Every single second of this video was a learning experience for me, and I've built several AR's. Phenomenal job diagnosing the failure. Subscribed.
@VCBird64 жыл бұрын
First thing I always check when someone has an AR that's not cycling correctly with good ammo is the gas key. 9/10 times it's either the fasteners aren't torqued or staked correctly, or one or both are broken. ESPECIALLY on a low round count rifle. Nice video :)
@jonathannoebel64573 жыл бұрын
This dude is a weaponry MD .I learned so much from him. He should have way more Subscribers then he does my hat is off to you sir.
@bradskeyt54444 жыл бұрын
You just increased my knowledge of understanding the AR platform thanks abunch. Great video
@bme437134 жыл бұрын
Such an underrated channel. Keep pumping out these technical videos
@bburg17764 жыл бұрын
This video blew my mind. Thank you for the information!
@mortem-tyrannis2 жыл бұрын
From knights armament I'd expect perfection, especially with the cost of their products.
@jaredbickmore24742 жыл бұрын
Sometimes you are just paying for the name
@onpsxmember2 жыл бұрын
@@jaredbickmore2474 Sample size of one.
@raifsevrence11 ай бұрын
@@onpsxmemberif it was me and I was paying $500+ for a BCG/$2,000 for an upper receiver, $4,000 for a complete rifle, they can stick their sample sizes up their ass. It better be right. If it's not, what the hell are you paying for ?
@JimmySilverFoot4 жыл бұрын
I found your channel from a Facebook post. I am very happy I did.
@Fender182413 жыл бұрын
i learned more in the last 15 minutes that i did from 4 years in college. outstanding sir.
@keggerous2 жыл бұрын
I've definitely got some amazing tips from this channel on how to double-check ARs and troubleshoot issues I have.
@chris34074 жыл бұрын
Thanks Chad! I would really like to see a video on extracting a broken fastener. If the owner wants the broken BCQ back, could you please show us another example?
@halseremodeling92533 жыл бұрын
KAC has there own proprietary bolt. I wonder if the BCG works better with kAC’s bolt and has different tolerances
@sippinonduty24354 жыл бұрын
Great video Chad, thanks for the great content
@surefire6504 жыл бұрын
Would not have expected that on a KAC rifle. Wow
@isaacward51624 жыл бұрын
I don't believe the rifle was kac just the bolt carrier.
@justinpatterson77003 жыл бұрын
there are always going to be mistakes made, but it is interesting to see a KAC bolt carrier messed up like that i agree. I'd still trust a carrier from KAC but this is something to keep an eye out for now that we see at least one instance of this happening.
@SynFuLLLz4 жыл бұрын
These are awesome -- I'd love to see comparison videos / BCG you recommend as "gas efficient"
@bobbyc27683 жыл бұрын
It's not as big of a deal if it's not the most efficient, especially because a crazy large number of AR's on the market are grossly overgassed so it actually kinda helps. But for a well gassed AR I think I remember him doing a couple new BCM's that passed with flying colors, one of which was his own. There are others but aren't coming to mind. Also as you use them they will obviously wear and those tolerances will get bigger as time goes on, but as long as your gas key is done right and there's no real leaks it should run fine if there's no other real problems
@joselyngarcia72432 жыл бұрын
Forward control designs BCG have always done amazingly as well. Watched this entire catalog of bolt carrier group testing and FCD has had extremely tight tolerances. Building my first AR-15 and still deciding between LMT enhanced bcg and Scionics/FCD.
@benverbroncos582 жыл бұрын
I can watch these videos all day ! Love your content man ! Thanks for all the knowledge too lol
@DaveDeVault4 жыл бұрын
For almost $500 ($1000+ if you get the SR25 bolt carrier and E2 bolt.) for the bolt carrier and E3 bolt this should outlast the owner and his kids.
@patrickbowman88413 жыл бұрын
the e3 bolt will only work in the sr15 uppers, which have different chambers cut for the knurled lugs on the e3 bolt face. this is not an e3 bolt and bcg, but a normal one meant for non-sr15 uppers.
@davidrichelson73673 жыл бұрын
Holy ish- MUCH respect..., m’captivated with your knowledge- & will follow closely for sure! Thx thx thx!
@Sluggaboy273 жыл бұрын
Can't wait to take your course!
@mikeholley44883 жыл бұрын
maybe KAC increased the 3 bore tolerances on the sandcutter for reliability in sand/ heavy fouling? just a thought
@Gunfighter5 Жыл бұрын
You have defiantly motivated me to become a gunsmith! I start at SDI for their associate's degree in firearms technologies! I know I will get some hate for this but I have some GI bill left and want to sue it for this degree. I have been unable to find a mentor close to me so this is my only option. This might help me get my foot in the door.
@projekt6794 жыл бұрын
Outstanding! This video helped me big time. Subscribed and contacting Knights Armament.
@floridaredfishin82093 жыл бұрын
Was this your BCG?
@projekt6793 жыл бұрын
@@floridaredfishin8209 No. I had one just like this and had to send it back. The gas key came loose.
@loganyoung24083 жыл бұрын
Oof. Would not have expected that from a KAC carrier...
@TheStig5053 жыл бұрын
People should keep in mind that most individual firearm parts are inspected on the AQL system. Brands that commands a higher price will inspect a higher percentage of parts, but most parts will still be sent through without inspection if the batch passes QC so some bad parts can slip through.
@JTTTTT8503 жыл бұрын
if you actually look at kac parts with an educated perspective this isn't surprising at all.
@anthonyzuccaro13 жыл бұрын
@@JTTTTT850 can you elaborate
@Hamchuck1123 жыл бұрын
You should be more open minded. Price doesn't mean everything.
@twee12gauge4 жыл бұрын
You rock, thank you so much for sharing your knowledge!!
@ultraspank84793 жыл бұрын
Best video work in the game! Great angles
@onna-day70473 жыл бұрын
You just made my day! Thank you!
@ultraspank84793 жыл бұрын
@@onna-day7047 your welcome. Keep up the good work. 👍🏻
@wagasteamofficial4 жыл бұрын
thannx for having a good heart,more information from you guys
@boxcomix14 жыл бұрын
You're the best bruh!
@williebulletman52174 жыл бұрын
Great video sir I really wish I could come join you at one of your classes but unfortunately no money for plain flight ✈️ & plus the number one I Reason no money for your class but please keep making the videos very interesting lots of great info
@mel2van34 жыл бұрын
Wealth of knowledge thank you very much
@deltabravolima15144 жыл бұрын
This is an incredibly educational channel!! I would love be able to do this for a living. I’ve always heard when you do something you love for a living that is not work. If I could do this then I’d never work a day again in my life.
@JP-gk2rk4 жыл бұрын
Great video sir.
@jeffreylonigro13824 жыл бұрын
Wow...nice work!
@shawngansert19734 жыл бұрын
Great content and good to know.
@tommyroberts8674 жыл бұрын
Good job. Great video
@dogshmog3 жыл бұрын
This is why I stopped buying KAC stuff. I started noticing tolerances and QC started to slip, a lot. For the price premium, it's just not worth it. The E3 bolt is interesting, but the proprietary everything just doesn't make sense to me.
@andrewstoll45484 жыл бұрын
That is freaking crazy.
@williamjacobs2362 жыл бұрын
Another great video .
@keithfagan54244 жыл бұрын
Could you do one on miss alignment of upper to lower receivers? such as chatter marks on the bottom of a BCG, really curious because I have sent back an AR 9mm for this three times.
@jackmehoff23634 жыл бұрын
Do you got videos going over parts youve seen that have a low failure rate? Basically an entire build?
@cantgetright42414 жыл бұрын
Good vid sir!
@vaughnwesterby51624 жыл бұрын
Great video thanks!
@silverboomerang2 жыл бұрын
Fantastic vid.
@paulhughes39614 жыл бұрын
I imagine you see all kind of issues with ARs I have a problem. I have a barrel that has a muzzle brake pined and welded. And I want to remove the brake and have it redone. It wasn't done right. What is the safest way to remove it so I don't damage the barrel.
@5jjt5 ай бұрын
Chad, maybe as part of your BCG autopsies, you could run compressed air thru the gas key opening, while the bolt is in, and check for leaks around the gas key w/ some mixture of soap & water?
@SchooloftheAmericanRifle5 ай бұрын
I do this in classes with oil. I also have a jig that measures gas loss.
@ronhmclaughlin4 жыл бұрын
What gauge are you using on the extractor?
@mcantu1974 жыл бұрын
It's also missing the liquid gasket that's supposed to be between the gas key and carrier body
@SvtRaptor134 жыл бұрын
This was awesome to see. If i was to buy one gauge for my rifles should it be the field gauge or no go gauge for the headspace?
@ScottKenny19784 жыл бұрын
I would get all three: go, no-go, and field. The go needs to fit in, if it doesn't stop using that rifle NOW. If the Field fits, stop using that rifle, NOW. No-go is the maximum as-new size, it safe to shoot even if the no-go chambers. Each one tells you something different. If you only have the no-go, you won't know if the chamber is too tight or too loose. Not to mention that I don't think you can buy them individually.
@otetechie4 жыл бұрын
It’s interesting that it’s taking the larger gauges, but doing it very consistently. It makes me wonder if they are doing that for a specific reason.
@ScottKenny19784 жыл бұрын
@ABlindMan1 would be my guess, too.
@TheSonsOfSimon4 жыл бұрын
Chad, please forgive my ignorance. What is the deal with magnetism check on the firing pin and bolt? What would cause a bolt or FP to become magnetic? What problems would it cause?
@SchooloftheAmericanRifle4 жыл бұрын
If parts are magnetic and you shoot steel cased ammo, it possible that casing and projectile shavings can stick to operating surfaces. This can cause reliability issues.
@gregnancyspear43674 жыл бұрын
Where can I get the gages you use?
@Jakon944 жыл бұрын
What company do you use for these go no go gauges?
@derekpayton9103 жыл бұрын
If it was banging wouldn't there be impact damage on the back of the gas key as well?
@staticpine2 жыл бұрын
Where does a person buy bore gauges like this used in the video?
@jammin68794 жыл бұрын
What brand are your no mar jaws? Thx
@gunsandcommissions4 жыл бұрын
Found it!
@Quality_Guru4 жыл бұрын
Great content! How does one contact you to have you inspect their firearm?
@jefflemaster28504 жыл бұрын
Quality Guru he said that the guy who he got the bcg from contacted him on the SOTAR Facebook group. Hope that helps! Good luck!
@Quality_Guru3 жыл бұрын
@@jefflemaster2850 Thanks for the intel.
@drewbaglin16324 жыл бұрын
I wonder how one of these would run in my sr-15
@A_R9123 жыл бұрын
where can i buy all the gauges used?
@ScottKenny19784 жыл бұрын
So, how well do those kac sandcutter BCGs work?
@MyLonewolf254 жыл бұрын
When they work and are in spec they’re great..
@ScottKenny19784 жыл бұрын
@@MyLonewolf25 that doesn't sound like a ringing endorsement.
@zackadams34053 жыл бұрын
Doesn’t newer KAC rifles have the rounded bolt lugs? My older KAC does and I thought that was a feature they were proud of. The bolt here doesn’t have rounded lugs.
@mil_spec_meats3 жыл бұрын
Also, my KAC bolt has a beefier extractor with dual springs. Don’t know if it is a KAC carrier with another branded bolt?
@Ronin_Noir3 ай бұрын
I think this Bolt is from BCM and not from KAC.
@gregorym14344 жыл бұрын
I dont think thats an SR-25 bolt. I own an SR25 ECC and my bolt is chrome like the rest of the carrier. The lugs are also rounded (as well as other stuff). I believe the owner of that gun is running a different bolt on that carrier. As far as I know, KAC is particular about parts from other companies being compatible with their stuff.
@Ronin_Noir3 ай бұрын
You are correct!
@KaneGregory3 жыл бұрын
Can you run this in a bcm or Noveske???🤯🔫💣
@craigbockbrader18724 жыл бұрын
Great videos but why don’t you ever respond to questions people ask you?
@onna-day70474 жыл бұрын
There was a group created to help answer all the questions. facebook.com/groups/sotar/?ref=share
@matthewpeebles78364 жыл бұрын
Quick question, which vice insert/blocks are you using? Keep trying to catch the writing in the videos but can’t make it out.
@Axe-m-All2 жыл бұрын
Everytime he inspects KAC they are sloppy
@timturner76094 жыл бұрын
Why is "field" worse than no go?
@Totem42854 жыл бұрын
Field gauge is the final step before being unsafe. This is because if something fails the field gauge it is unsafe to use in any case, even in life or death situations such as in the "field". But if it passes a field gauge while failing a no-go then the item can be used but it will not be optimal. no-go is more for the purpose of ensuring a quality product while field gauge tests the safety of a product.
@mealteam6.12 жыл бұрын
This is why u DO NOT BUY EXPENSIVE PARTS SECOND HAND. EVERYTIME U BUY EXPENSIVE STUFF SECOND HAND YOU'RE GONNA BUY IT TWICE.
@kinzieconrad1054 жыл бұрын
Cheep bolt bolts.
@johnmontes85434 жыл бұрын
That e3 bolt is proprietary it won't work on barrel extensions that aren't knights armament that being said that bolt isn't E3 its something else
@vlaricshard24 жыл бұрын
I think he mentioned that the carrier is sometimes sold separately, because it may be going in a different rifle.
@matthewwest70964 жыл бұрын
I own one of these and that definitely isn’t the E3 bolt from Knights!!!!
@eryk66883 жыл бұрын
I bet most of the companies' products that are featured in your autopsies are not big fans of you
@seanoneil2773 жыл бұрын
Or maybe they appreciate the "heads up" on their QA/QC process. Any mfr that cares about quality would appreciate learning about something that slipped through the cracks.
@marvinpitts87994 жыл бұрын
The Bolt carrier is KAC but the bolt, firing pin, extractor, and cam pin are not
@SchooloftheAmericanRifle4 жыл бұрын
Yes. I stated such in the video.
@Richardjohnson69694 жыл бұрын
Marvin Pitts thanks captain obvious
@bandogmerch4 жыл бұрын
That's not a KAC bolt...
@Richardjohnson69694 жыл бұрын
Reggie Kanan and? It was clearly stated in the video. KAC sand cutters are sold as a bolt carrier without bolt, allowing you to use the bolt of choice in non KAC barrels due to barrel extension and bolt being proprietary to knights.