AR Failure to cycle...

[Seventy4Blazer]

ok, i got my first chance to go put some rounds down range on both my AR-15 M4 and my 10/22. no issues whatever with the 10/22 except for the issues with the AR that didnt let me get the 10/22 sighted in fully...

the AR is a Anvil Arms lower with a del-ton kit to finish it off. Carbine model, no M4 feed ramps, non chromed barrel or bolt. this is a BARE BONES kit.

the firs 30 rounds went through NO problems. the next 26 went through fine as well. on the 57th round the bolt didnt go all the way home and i had to get it seated with a bit for force... i couldnt get it to fully seat or fully extract. fired off the round, put the mag back in, racked a round and had problems there left and right after.

the issue: after a couple rounds the bolt would get stuck back BEHIND where it would lock back on the bolt catch. i can feel it hanging up on something, but cant see any marks on anything or tell what it is hanging up on. everything cycles without ammo in it. there is a SLIGHT bur on the FWD assist... is it catching up on this bur? it take a bit of playing with it to get the bolt to slide home. then no issues for a few shots, than an issue...

so... any ideas?

[c.sander]

Originally Posted by Seventy4Blazer

so... any ideas?

sounds like its junk to me... ship it on over to me and ill dispose of it for ya

[wlptpd3]

What kind of ammo were you using? and then what type of magazines these are probably the first place to start looking when having feeding problems. Most function problems are either ammo or mag related so start there, Use good brass cased ammo and known quality mags and try again.

[Seventy4Blazer]

crap, i meant to post that info up...

i cant see it being related to either due to HOW it is hanging up. it is hanging up about 1/4 inch behind the bolt stop and is a PITA to get "un-stuck"...

ammo is remmington 55 grain .223 from wallmart

mags are ones i got from... well they are mil spec... ya dig? lol they have worked MANY ranges and it did this on 4 mags. all are made by different people... all are ugly, but in GREAT shape inside. i cleaned them and put them back together less than a month ago.

[Seventy4Blazer]

Originally Posted by wlptpd3

probably the first place to start looking when having feeding problems.

ohh, missed this part... NOT feeding problems. feeds great, when it cycles...

[Lycanthrope]

Hanging up on the rear of the mag?

If the burr doesn't catch when there is no ammo, I can't see how it would matter since it would catch the bolt carrier.

Or...something in your lower may not be put together right. Strip out the bolt and carrier and look for anything loose......maybe the buffer detent pin?

[Thekatar]

Check the usual suspects first:

bad mags
bad ammo
loose carrier key
not enough lube

[Seventy4Blazer]

Originally Posted by Thekatar

Check the usual suspects first:


not enough lube

too much if anything to do with lube... lol i got a good bit in my eye...

[JayBell]

several possible issues:
1 wrong buffer/spring combo, or a problem in that area.
if you take the upper off the lower, are there any marks indicating that the key has hit the rear buffer tube receiver ring?
If so, don't shoot again until you replace the spring and bufffer with the correct one for that length buffer tube.

2 carrier or firing pin is hanging up on the hammer notch
if the firing pin has bent the retaining cotter pin, or if the wrong size collar pin has been used, this can happen

3. buffer pin detent is loose
repair/replace

4 gas key is jamming the gun up if its loose.

tighten the gas key.

thats kinda the limit if this is whats going on, not too much in the back of the gun that can cause this aside from what i've mentioned.

its kinda hard to improperly assemble the forward assist and have the gun still work at all, AND have the assist still in the upper.

[Seventy4Blazer]

well thanks to Lycan i THINK it was the fact that the stock was not as tight as i think it should have been... so, i will get some loc-tite on it and try again...

i will keep you all posted, and thanks for the answers.
Grant