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Posted: 12/14/2011 2:24:56 PM EDT
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Recently I've noticed that when the bolt carrier slides over the top round in the magazine, it leaves 2 or 3 fairly deep gouges in the case and on the bullet. I haven't been able to shoot it recently, but in the past I've had problems with cases getting stuck in the chamber, I suspect this is related.
Here's a round for example. I inserted a full magazine, pulled the bolt back, then released the magazine before letting the bolt go back forward. I can catch my nail in the gouges. 
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I did a little investigating and found out which parts of the bolt and carrier are contacting the cases. I very lightly filed the corners and edges, but the problem still persists. What could cause this? I've heard that a light scratch on the cartridge is normal, but these are deep gouges that I can catch my fingernail in.
I found some brass dust on the areas indicated. I also lightly filed the same areas, but the problem still persists. 
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