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If its short-cycling, which would mean something up with the gas system, the bolt may not travel rearward enough to cock the hammer, and the hammer just follows the bolt closed. Is there any indent at all on the primer? I can't remember if that bolt has a firing pin block in it or not. Some do, so it won't go forward until the bolt is locked up, which would keep the primer from being deformed from a hammer following the bolt. My guess is short-cycling, and you might want to try it with other brands of ammo just to see what it does.
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