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Message: <blockquote data-quote="gillman7" data-source="post: 736102" data-attributes="member: 2784">OK, bought a brand new 6920 and took it to the range today. Shooting M855 to sight in, first three shots, good pattern, needs some adjustment. 4th shot, no bang. Drop the mag, pull the bolt, case is in the barrel. Pulled it out, no primer strike, no scratches, nothing. Replaced the mag, let the bolt go, fired twice, third shot, same thing. Thought it might be the mag, changed it out, same thing. Tyromeo and Adluginb were there, so I changed out the lower, and everything was fine. In looking at the Colt lower, found that it has a heavy buffer. Ty thought that it might be too heavy and causing it to short stroke. It would cycle, just not lock up tight.I am thinking this could be the problem, but am curious if anyone else has had this issue?</blockquote>