AR-15: America's Rifle

M67 said:
Didn't catch the 556 in the link, AR thread, figured it was a M400

Got pics of dent in the brass?
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It's been a while since I've shot it but I will try to get a picture. It's in the side of the brass about 3/8" long and about 60 deg from the long axis if I remember correctly.

It is a gas piston design and has an adjustment to open up the gas flow so it will cycle if it gets dirty. I think it would have to get really dirty to need that but when I tinkered with it I don't remember it putting a bigger dent in the brass.

Maybe I will try taking a video of it cycling when fired with a GoPro and see if I can slow it down and see what it's hitting. Since it is so consistent and uniform I don't think it's the deflector. I haven't had that issue with ARs but maybe it's the cause?

Thanks for the replies.

Edit: I just pulled the rifle out and it doesn't have a deflector so that answers that question.
 
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Possibly hitting the edge of the ejection port. Gas piston systems keep the bolt assembly cleaner but contain all the fouling in the forward end of the system. Get a good foaming cleaner and give it a run through, also try different ammo. Then I would try dialing it down a bit, if you can.


-Xander
 
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I think it may be hitting the back of the ejection port. There is a vertical piece with a sharp edge that looks like it could easily do it. I tried to circle it and attach the picture. I wonder if anything can be done? I would think about slicing a piece of tubing and gluing it in place. I think it would interfere with the bolt and would get knocked off. Even rounding it would probably leave a dent.

Is there a way to adjust the extractor? Maybe altering the angle it releases?

On a side note, why are there no decent paint programs for Android? This one changed the aspect ratio. I tried half a dozen and they were all terrible. Finally got a circle on a picture. I have looked in the past and they all suck assuming they even start and don't crash on start up.
 
Sig 716 patrol
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