Failure to eject spent brass

firefighter_21701 · Jun 12, 2015

Narrowed it down to a few possible but somehow my mind keeps saying ejector spring maybe bad. The brass is easily rammed out with a dowel rod. But upon examination it looks as though where the ejector pulled on it is ripped off leaving it flat on one side. The ideas I've come up with ( with brain storming with a buddy) are over gassing, wrong buffer and spring, bad gas seals and possibly bad ejector spring and maybe need to hone the chamber out. I stopped firing after two rounds cause it was literally ruining the follow up shot buy jamming a live round between the chamber wall and The unejected brass. it seems like it wants to cycle fine just not eject. Any advise would be helpful. If it helps the lower is spikes tactical the upper is an alpha sports laser etched forged upper barrel is a 16" 5.56 Nato Govt Profile Barrel 1:7 sold by alpha sports. Bolt carrier and bolt are an AIM AR/M16 .223/5.56 9310 MPI BDG Bolt Carrier Group.

lx1x · Jun 12, 2015

Try different round? Maybe its the ammo.. If its getting stuck in the chamber.

BradMacc82 · Jun 12, 2015

Had the same issue with a piston upper and silver bear ammo. Got it to behave better with a heavier buffer (T3) and a Wolffe XP action spring, but it'd still occasionally tear the rim and leave an empty stuck in the chamber using silver bear.

Best bet, try different ammo first. It's likely over-gassed, if it tears the rim off of known quality ammo, time for an adjustable gas block.

friendlyhippo · Jun 12, 2015

tearing the rim off would be the extractor, btw. not the ejector.

but another vote for overgassed like crazy.

firefighter_21701 · Jun 12, 2015

Sorry got my terms wrong I'm sitting at a shipper waiting to get my trailer loaded and the bastards just left for break. Been here 5 hours already and am aggravated. Thanks I'll have to try the different ammo when I get back home in July to test the theory.

Sent from my HTC6525LVW using Tapatalk

firefighter_21701 · Jun 12, 2015

If it makes any difference I was using m193 5.56x45 ammo purchased from cabelas

Sent from my HTC6525LVW using Tapatalk

lx1x · Jun 12, 2015

Prvi Partizan?

firefighter_21701 · Jun 12, 2015

According to the stamp yeah I think so. PPU is the marking right.

Sent from my HTC6525LVW using Tapatalk

BradMacc82 · Jun 12, 2015

PPU brass is soft, in 5.56 and .308 variety. Don't bother with Sellier & Bellot for diagnosis, I've noticed they tend to run a bit on the warm side, which won't help an over-gassed rifle.

firefighter_21701 · Jun 12, 2015

OK any recomendmations for ammo for after I settle the over gassing issue

Sent from my HTC6525LVW using Tapatalk

BradMacc82 · Jun 12, 2015

Once the over-gassing is handled, ideally there should be no issues with it reliably running ANY type of ammo - brass, steel, cheap or high-dollar.

If you end up doing an adjustable gas block, there's going to be a little fine-tuning. But if you pick and stick with one brand/load, the tuning will be minimal.

clandestine · Jun 12, 2015

As said, looks way overgassed. Most direct fix is adjustable gas. Heavier buffers and springs can help some but the heavier ones will cost the same as a good SLR rifleworks adjustable gas block.

The barrel mfg likely just went way too big on the gas port.

firefighter_21701 · Jun 12, 2015

Thank you all. Ill have to wait till July to fix it since I can't have it on my truck

Sent from my HTC6525LVW using Tapatalk

DaemonAssassin · Aug 14, 2015

As an update:

I spoke with the OP today and the shop he took it to, ran some XM193 through it and says it functions fine. No issues with their tests. When he gets a chance, he will do some range time and then report back on his experiences with a different ammo.

firefighter_21701 · Sep 1, 2015

Finally got it back. Only took me a bit of time. They claim to have fired Prvi Partizan, wolf. Xm193 and m855. Plan on taking it to the range today with the prvi partisan and some xm193 I picked up. They claim not one failure recreated but did find a slight hoping mark inside the chamber. They claim it could be bad ammo guess I'll find out.

firefighter_21701 · Feb 16, 2018

I know it's been a long time since this post was updated as is such since I don't get on here much anymore. But for those that commented I'd like to thank you for your insights once again. Also wanted to say that it took replacing the whole upper receiver ( built a new one) to get it working properly. The shop that did my original upper screwed it up big-time. Rockset in the handguard screws and original gasblock setscrews. Had it taken apart it didn't have any anti corrosion on the barrel thread two spacers in it and wasn't tightened down properly. Went to reassemble and it took 5 spacers to get the right position for the barrelnut. Decided it would be safer to build a new one than take a chance on firing the original. Again thank you everyone that commented. Now all that's left is to sight the 4 year build in.

.

Sent from my HTC6545LVW using Tapatalk

Failure to eject spent brass

The #1 community for Gun Owners of the Northeast

Member Benefits:

Active Member

Attachments

Peanut Gallery

Ultimate Member

Banned

Active Member

Active Member

Peanut Gallery

Active Member

Ultimate Member

Active Member

Ultimate Member

AR-15 Savant

Active Member

Why should we Free BSD?

Active Member

Active Member

Users who are viewing this thread

Log in

Forum statistics