I found out the hard way that if the bolt doesn't close all the way the hammer still falls and strikes the firing pin. I had this happen and blow the side of the bolt apart. I sent it back and they were good about repairing the problem, said they had updated the recoil spring with a new one that fixes the problem. But the problem wasn't fixed, if it feeds a round and the bolt stays open a little the firing pin still strikes the back of the round. My new Sig 522 doesn't do that, just sayn. I haven't tryed the h&k or colt ar platforms.
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