Earlier today I noticed that one of the two pins that hold the fire control group in place had come out a bit. I realigned it and seated it again. Went to the range and the same thing happened. Any ideas whats going on? Looks like the pin likes to get pushed out leftward until the right side gets unseated from the lower then it stops. I assume tension from the springs and the fact it gets angled a bit keeps it from moving, but why is it coming loose to begin with? AR has ~750 rounds through it. Lower kit is PSA, lower is engage billet.