AR One Shot Wonder !!!!

[mcwulf30]

Gentlemen

I have recently built my 2nd AR.
20" heavy barrel,Auto BCG and blackhawk 6 pos stock.

Now.......I test fired it today with some Tula.
first 2 shots ok.

After that......it was a one shot wonder machine.
Checked gas block alignment and it is good.

Also......it was not ejecting everytime and forward assist was used once or twice.

QUESTION:
Too light a buffer?
Too heavy a spring?
Auto BCG too heavy for Tula ammo??

Suggestions please.

 

[flashpuppy]

Lube?

 

[JollyMon]

If it was Tula steel case, Thats my bet on what was causing the issue.

 

[M67]

Lube?

+1 ?

And good lube, not rem oil or hoppes

 

[Rocket]

My nephew had issues with his Tula ammo. The extractor kept peeling back the rim. Nothing wrong with the gun. Change ammo and try again

 

[ryknoll3]

I would try some brass cased 5.56 ammo. I know Wolf is a lot weaker than 5.56, Tula may be the same. Is your rifle chambered in 223 or 5.56? What kind of gas block are you running? If you load one round in the magazine, does the bolt lock back after firing?

 

[jd4320t]

My Stag didn't like Tula ammo when it was new. I haven't tried any since.

 

[USMC-Johnson]

sounds like it is short stroking...

 

[mcwulf30]

Well....you could fire it once. pull the trigger again and click. Was weird because it acted to me like it cycled sometimes but......there wasnt anything in the chamber.

I use only lucas gun oil....
GOOD STUFF!!!

Gas block is after market.

I just took everything apart and used calipers on gas block hole and barrel hole.
Reset everything and gonna try again wed. I'm gonna take some brass and tula and shoot both and inspect both.
Chambered 5.56 ,1:9 twist NATO heavy barrel.
Im gonna take a heavier buffer (longer too) and different spring too.

 

[Tombs]

Sure you don't have an excessively heavy buffer in there? A rifle length gas system is not like a carbine gas system.

Any decent AR should manage to run that stuff, if that's not the problem then I would be taking a hard look at the chamber.

And your last comment makes it sound like your magazines aren't feeding.

 

[mvician]

Break it in with good ammo before trying to run under powered Tula junk.

 

[rvb]

Im gonna take a heavier buffer (longer too) and different spring too.

1st, get some decent ammo to test/troubleshoot with. Make sure the BCG is WELL lubed.

2nd, the assumption is it's short stroking... verify by firing one round w/ an empty mag inserted. If the bcg locks back, good. If not, it's short stroking.

3rd, if it is short stroking, a heavier buffer is the opposite of what you want. Not sure what you mean by longer. that scares me. There should only be one appropriate length for your stock. Putting a "longer" one it is just trouble waiting to happen.

you said you measured the gas port... how big is it?

assume the mags are known good (work well in your other AR)?

what spring and buffer are you using?

-rvb

 

[churchmouse]

Break it in with good ammo before trying to run under powered Tula junk.

^^^^^^^^^^^^^THIS^^^^^^^^^^^^^^^^^^

Clean the chamber completely and run some good ammo through it.

 

[red_zr24x4]

Look at your gas tube and make sure it's not plugged. We put together an AR for my brother last year, his was a one shot wonder also, the gas tube was packed full of fine white powder. Changed the tube and it worked great.

 

[wsenefeld]

Well....you could fire it once. pull the trigger again and click. Was weird because it acted to me like it cycled sometimes but......there wasnt anything in the chamber.

Problem still sounds like short stroking. The bolt only needs to come back a fraction of the way to reset the hammer. I have a friend with a 20" AR and the same problem but he's too lazy to troubleshoot. Who makes your upper or barrel? Sounds like it's under-gassed causing short stroking. Could be from the weak ammo or an under-sized gas port in your barrel.

 

[ryknoll3]

Best bet is to try again with some NATO spec ammo. Something in 5.56, not .223. .223 ammo is usually loaded weaker.

 

[w_ADAM_d88]

I would not break in an AR with Tula. I shoot Tula thru mine with no problem, but I have also ran probably close to 1K rounds of brass thru it first.

 

[Wes225]

Well, your first mistake was using tula in a new gun. It sounds like short stroking. Make sure your gas block is properly aligned over the port.

 

[indykid]

I am going to chime in with the others and tell you to try real ammo, brass cased to start with before you blame your rifle for Tula junk not cycling. I might as well have burned my money instead of throwing it away on a case of Tula .223.

It is so poorly loaded that some round fire ok, and some when I remove them from the chamber when they don't eject properly are ice cold. And this is from a Norinco 84S-1 as well as a Romanian SAR-3 that until trying the Tula would cycle anything as a good AK variant should. To say they wouldn't cycle my closer tolerance M4gery is an understatement.

Try some good brass ammo before you blame your rifle.

 

[jimbobcooters]

+1 ?

And good lube, not rem oil or hoppes

you mean rem oil aint no good? hahah