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allaroundhunter · June 25, 2013, 10:54 AM

I'm guessing that he bump fired the second round. The third round wasn't actually hit with an intentional primer strike, it was touched by the floating firing pin. Any round that you chamber in an AR will have a small indentation in the primer because the firing pin is not held tightly in a rearward position, it is allowed to "float" with a little wiggle room.

As to the case stuck it could mean a couple things. He could have an extractor problem, or the rifle could be over gassed and the BCG is bring pushed too quickly to hold onto the case. The fact that the rim of the case looked undamaged however makes me think it is probably the former.

Can you give us a quick parts list? Barrel, gas system, bolt, bolt carrier, buffer?

June 25, 2013, 10:54 AM	#5
allaroundhunter Senior Member Join Date: May 6, 2012 Location: Southeast Texas Posts: 1,670	Re: AR Issues I'm guessing that he bump fired the second round. The third round wasn't actually hit with an intentional primer strike, it was touched by the floating firing pin. Any round that you chamber in an AR will have a small indentation in the primer because the firing pin is not held tightly in a rearward position, it is allowed to "float" with a little wiggle room. As to the case stuck it could mean a couple things. He could have an extractor problem, or the rifle could be over gassed and the BCG is bring pushed too quickly to hold onto the case. The fact that the rim of the case looked undamaged however makes me think it is probably the former. Can you give us a quick parts list? Barrel, gas system, bolt, bolt carrier, buffer?