Great pistol upper - ABC RIFLE COMPANY AR9 9mm Luger Pistol Billet 7in Barrel M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle

Great upper for the psa lower I had built. I had originally thought there was loading problems but later realized this was user error. With not automatic bolt hold open on the part shot you just need to to make sure the mag is fully seated before you try it charge is and then there’s no feeding issues