Question for the AR experts??

[Blood Trail]

60 rounds aint enuff to make it that dirty. I've ran 100's of round through mine in the field when I was in the Corps and for the most part, didn't have an issue. Granted, these were Colt M-16A2's.

[hoythitman]

Okay, if I understand correctly, it WILL chamber a round manually, but not automatically. Worked fine for 60 rounds, then failed. Right?

If so, I'm going with loose gas block. It could be overgassed and running too fast, not allowing the next round to come up before the bolt goes forward, but that would have been from round one, not 60 rounds in. It could be under gassed, thrusting the bolt back enough to eject, but not far enough to catch the next shell. Best way to tell is where the spent cases land. I'm going with under gassed due to a loosened and leaking gas block since it worked for a while, then stopped working, and since you have unreliable extraction, overgassed would eject well. If it were a buffer problem, it would have been a problem from the first shot.

He said it wont do it when he manually releases it too.

[keatonskidmore]

Yes he bolt would go home and miss the next round. I can manually put a round in with the charging handle (Yes I let it slam forward). I cant tell you where the spent cases were landing I never looked at that. Sometimes it would jam up also not ejecting the spent round and hang half open.

He said it wont do it when he manually releases it too.

Read what I quoted from him. States it will chamber when done manually. Txfireguy and I are on the same track. Check your gas system.

[offshore2005]

Thanks for all the input. I could not take it anymore. Stripped everything down and 're did everything. Only thing I found loose was the Bolt Carrier Key so I tightened it back up and put enough oil on her to make a rusty wrench happy. Back at the range now and everything seems ok with 40 rounds down range. Thanks again for all the help.

[HoustonR6ryda]

gettin'broke in-could I get the specs on that upper? if you have time thanks-looks good.

[hoythitman]

Read what I quoted from him. States it will chamber when done manually. Txfireguy and I are on the same track. Check your gas system.

I completely misread that one. Thanks.

[hoythitman]

I need to start using my computer to read these things instead of my phone. lol

[keatonskidmore]

I need to start using my computer to read these things instead of my phone. lol

I feel ya. I would have missed it two if I hadn't been on my computer probably. Still thank you should check your gas tube. Could be a burr if its not loose. Or the tube could be fowled with something.

[offshore2005]

gettin'broke in-could I get the specs on that upper? if you have time thanks-looks good.

•Hardened Arms M4 Feed Ramp Flat Top Receiver
•Upper receiver is machined from solid 7075 billet aluminum
•Black anodized mil-spec finished upper receiver
•Feed ramps for increased feeding reliability on barrel and upper
•Laser etched T-Marked upper receiver
•Stainless Steel 5.56 High End Barrel
•Chambered in 5.56 NATO
•16" HBAR Profile barrel with M4 Extension
•1/9 Barrel Twist
•.750" diameter at gas block
•1/2x28 threaded muzzle/barrel
•Low profile gas block
•Barrel dimpled to secure gas block
•Carbine length gas system
•A2 flash hider
•13" Houlding Precision CMX Free Float Handguard w/ Integrated Top Picatinny Rail

https://www.hardenedarms.com/ecProduct_173_27

[txfireguy2003]

Thanks for all the input. I could not take it anymore. Stripped everything down and 're did everything. Only thing I found loose was the Bolt Carrier Key so I tightened it back up and put enough oil on her to make a rusty wrench happy. Back at the range now and everything seems ok with 40 rounds down range. Thanks again for all the help.

That was it, loose gas key. One of the biggest and most common complaints you'll see about "tier 2 or 3" AR's, improperly staked (or not staked at all) gas keys. It's the first thing i look at on any production AR now. A loose gas key will cause failures every time.

[DaveC]

That was it, loose gas key. One of the biggest and most common complaints you'll see about "tier 2 or 3" AR's, improperly staked (or not staked at all) gas keys. It's the first thing i look at on any production AR now. A loose gas key will cause failures every time.

With that said, the bgc I received with my Sabre defense upper from Red-x arms is weakly staked to say the least. The marks are there, but my other BCGs are staked much deeper.

How do I stake it deeper? Is it as simple as pulling out the ole punch and ball peen and giving it a few whacks each?

[Bily Lovec]

With that said, the bgc I received with my Sabre defense upper from Red-x arms is weakly staked to say the least. The marks are there, but my other BCGs are staked much deeper.

How do I stake it deeper? Is it as simple as pulling out the ole punch and ball peen and giving it a few whacks each?

dont overstake it. you have to be able to back the screw off.

it may be ok, it doesnt take much to hit the spec.

[offshore2005]

That was it, loose gas key. One of the biggest and most common complaints you'll see about "tier 2 or 3" AR's, improperly staked (or not staked at all) gas keys. It's the first thing i look at on any production AR now. A loose gas key will cause failures every time.

That's all I found loose and yes it was very loose.. did not think anything of it at the range seeing how I put an extra BCG in and still had the same problems. Last night I took apart the entire gun so maybe something was out of line (did not look it) but maybe so. This morning had no problems what so ever.
Thanks again for all the help and advice.

[DaveC]

dont overstake it. you have to be able to back the screw off.

it may be ok, it doesnt take much to hit the spec.

Good deal, I'll leave it be until it becomes an issue.