Great piston upper in 300blk - Adams Arms P2 AARS .300 BLK 8in Upper Receiver

This upper has a lot going for it: tested first with subsonic rounds, no issues, fits perfectly on Aero Precision lower, very accurate 8" barrel, and the BCG is higher grade, with porting cutouts, while the charging handle is a Radian L series. I would highly recommend this upper for a piston build. Next, I'll put a Guntec USA Micro comp/shroud that will recess into the hand guard and still have clearance for adjusting the piston up front.