What dies are you using? I use the RCBS SMALL BASE X DIES for my M1A and my ar style rifles. Some say they are not needed, but I use them and have zero issues. Also make sure your full length sizing all the way down, function is everything in these systems.
Armalite is not new to this game so please give them a call.
Bolt bounce, it will effect things, the heavier your buffer the less you have. Single loading has only set you back in your quest.
This gentleman is well spoken and lays **** out very well
Vltor A5 Stock System - Initial Impressions - YouTube