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Message: <blockquote data-quote="mr ed" data-source="post: 3958913" data-attributes="member: 6777">Could be as simple as buffer tube one turn out reducing spring pressure. Even a new spring won't help.A common problem is putting in hammer spring backwards. misfires, reduces trigger pull sounds good but it's not, reduces hammer striking ability, can lead to full auto scenario.I would suggest garbage in locking lug area or junk in firing pin hole, but you said upper works on other lower. which rules those out.One other is you need a heavier buffer because your getting bolt bounce.</blockquote>