Sometimes caused by a firing pin that is too sharp.
Also, I would recommend this to prevent blown primers from falling into the fire control group and causing a stoppage: http://www.brownells.com/rifle-parts...442-62300.aspx
Likely also a chamber that is too tight. All the more reason to spend the money and get a Colt, DD, BCM, LMT, Larue, or another well-known brand...in the AR 15 arena, you DO in fact get what you pay for.


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