I have a PSA 8.5" 5.56 uppered pistol and it has been great. I did swap out the gas block for an odin works adjustable block and modified the buffer into an H2 buffer. It went from being over-gassed and jumpy to much more controllable. The purpose of the pistol is for self-defense in the 50-75yard range. In the house defense and sometimes a truck gun. I only shoot steel cased 75grn soft point/HP ammo. Accuracy is good enough for me and my purpose at about 2.5 MOA consistently.