Hello, I am currently having some 300Blk feeding issues and looking to see if anyone can give any insight. It cycles everything supersonic fine, But when it comes to subs she struggles. It has a dedicated nomad 30 suppressor on it. BA pinned .750 gas block. Rest of parts list will be listed Below. It has an A5 buffer system, but i have to drop it down to a A5H0 to get it to pick up a new round 50% of the time. Never locks open, Again this is with subsonic ammo. Any insight is great.

BCM upper
10.3 Ballistic advantage barrel w/ .750 pinned gas block
Black river tactical EZ tune gas tube.
SLR rail.
Black river tactical BCG
A5H0 and springco Green spring.