AR-15 failing to feed and gouging bullets, help!

[rpol98]

I also have a seekins dmr that's chambered in 6arc. Mine jams the same exact way and leaves the 2 gouges on the bullet. Berger 95gr classic hunters and 103 elder jam the same way. I'm using duramags. Have you found a solution?

you don't know if the 2 gouges on the bullet are from the mag feed lips, or from the M4 feed ramps of the barrel extension.

Metal mag feed lips usually carve out gouges on the brass, not so much the bullet projectile.

you probably have some serious sharp edges on the barrel extension feed ramps, left over from the usual machining. This is common with most AR barrels. Those sharp edges can be deburred and polished so you don't get gouges on the projectile, but that usually has to be done before the barrel is assembled to the upper.

The Other Site: how to romance your AR build

I'd guess that after 500 to 1,000 rounds of shooting, those sharp edges may just get "deburred" from normal usage. plus-or-minus. copper & brass wearing on steel.

 

[blee01]

It's doing it on both sides on the mag. Tried some 95gr vld hunters today and same thing. Seems like the feed ramps are not wide enough.

 

[rpol98]

It's doing it on both sides on the mag. Tried some 95gr vld hunters today and same thing. Seems like the feed ramps are not wide enough.

without seeing your barrel extension or your feed ramps, I'd guess it's not the width of the feed ramp itself, but the corners shown below in the red circles.

 

[Turpentine21]

It's doing it on both sides on the mag. Tried some 95gr vld hunters today and same thing. Seems like the feed ramps are not wide enough

If your bullets look like the bullets in the photos posted by the op I'm inclined to say it's a feedramp issue. Unless the mag feed lips are really tight and releasing the rear of the cartridge late. This lets the bolt jam the bullet into the feed ramps and doesn't allow the case to pop up out of the mag quick enough.

 

[ARlife4me]

I sent it back to seekins, they cut back the barrel and rechambered with a new reamer then polished the feed ramps. Everything is seeming to work well now from what I can tell.

so, it's running 100% now?

 

[dfanonymous]

NH₄NO₃ AL, is the best ammirite?

 

[ARlife4me]

NH₄NO₃ AL, is the best ammirite?

maybe i need to use that instead of 46-0-0

 

[dfanonymous]

maybe i need to use that instead of 46-0-0

I'm sure the OP knows one way or another

 

[eod.tek]

so, it's running 100% now?

Yeah, about 300 rounds in and it's feeding flawlessly and when I eject a round, no gouge on the rounds. I think it was a feed ramp issue they took care of. Best customer service I've delt with in some time.

 

[eod.tek]

NH₄NO₃ AL, is the best ammirite?

Seen a lot of ANAL in my time

 

[dfanonymous]

Seen a lot of ANAL in my time

I bet you have you crabby stud.
I'm sure a lot of us have.

 

[M1A1ABRAMS]

I got a upper one time that had the wrong ejection plunger. It would do the same thing. Not allow the rounds to feed correctly. It was a tad to long. It would scar the metal casing. It was a 7.62x39 AR 15. Once I replaced the ejector it ran fine. It took me a little while to figure this out. I initially thought it was mag, feed ramps, etc. Till I put a round in the bolt head. And quickly seen it would not seat flush. I bought the upper as complete. Just in case anyone else has a similar issue. This may be one more thing to check.

 

[ARlife4me]

I don't get these bolts with double ejectors! Especially in ar15's. KAK has those on their magnum bolts and I feel like removing 1 of them. So far there isn't an issue on my AR6.5PRC. 1 day I'll get my hands on 1 of those from Kaliber Tech. Problem now is which cartridge!

 

[Turpentine21]

I got an upper one time that had the wrong ejection plunger. It would do the same thing. Not allow the rounds to feed correctly. It was a tad to long. It would scar the metal casing. It was a 7.62x39 AR 15. Once I replaced the ejector it ran fine. It took me a little while to figure this out. I initially thought it was mag, feed ramps, etc. Till I put a round in the bolt head. And quickly seen it would not seat flush. I bought the upper as complete. Just in case anyone else has a similar issue. This may be one more thing to check.

I know PSA had a problem where the extractor spring was too strong and wouldn't let the extractor ride over the rim of the cartridge when chambered. This was in some of the very early 308s they did.