Ripping chunk out of case

**Vaal** · 22-07-2018, 20:26

Why does my Stag Arms extractor try to rip a piece of the rim out of the cases? I can clearly see the part where the extractor made contact with the rim. Twice it ripped that part out and I had to knock the case out from the muzzle end. It does it on military ball and reloads(24gr S321 with 55gr Frontier Cmj).

**Trayton** · 22-07-2018, 21:20

Must be the rutting season, stags try and kill everything in that season.

**Trayton** · 22-07-2018, 21:22

So the case is actually getting stuck in the chamber!?

Oversized case getting stuck?

**bronxlive** · 23-07-2018, 04:45

Had the same issue with my NEA. Had the chamber polished and the problem was fixed.

**Vaal** · 23-07-2018, 07:04

Originally Posted by bronxlive

Had the same issue with my NEA. Had the chamber polished and the problem was fixed.

I have polished the chamber allready with 600, 1200 and 1500 grit water paper. I have used Norinco mill surplus and full length resized reloads. I think I will buff a couple of rounds and see if they do the same.

**ARM505** · 23-07-2018, 08:32

I want to say it's overgassed but I don't even have an AR or am even vaguely qualified to say so. So there is that little problem....

So I'm going with Traytons suggestion.

**MrK** · 23-07-2018, 08:47

What buffer are you running? Internet wisdom suggests a heavier buffer delays extraction slightly. An adjustable gasblock may also work if your rifle is overgassed.

**Gleock** · 23-07-2018, 10:01

Originally Posted by Vaal

I have polished the chamber allready with 600, 1200 and 1500 grit water paper. I have used Norinco mill surplus and full length resized reloads. I think I will buff a couple of rounds and see if they do the same.

Probably changed the shape and size of the chamber after that as well.

Are there ejector marks and what do the primers look like?

**Vaal** · 23-07-2018, 13:41

Originally Posted by Gleock

Probably changed the shape and size of the chamber after that as well.

Are there ejector marks and what do the primers look like?

I do not think I could change the the chamber profile with a bit of wet water paper. I will see if I can attach some pics of the marks.
The primers look normal and not extremely flattened. There is a very light ejector mark on the rim of the cases what have been shot but you can clearly see where the extractor got hold of the rim.
I use the standard out of the box gas block, buffer and recoil spring but I have installed a comp on it. I can not see that the comp might change anything.