Took my new upper out yesterday to test it out and sight in the scope. It ate every round without any malfuctions(maybe). On a few occasions it double tapped the rounds. Its a 10.5" 5.56 with a aac sdn6 and the lower has a velocity 3# trigger. Ive had this lower on my 8" .300 blk suppressed and unsuppressed and this has never happened. Anyone know what might be going on? Thanks