Its a .40. Gun has the essential Xtreme parts (front sight, guide rod, delta hammer, trigger, medium hammer spring and light firing pin spring, the FPB is removed and I use the 2.0 Xtreme firing pin. It pops all primers and trigger pull is 2 lbs. Really like it. I shoot heavy bullets (220gn) with a fast powder (Lovex D032) achieving 173PF with 3,8gn powder at 1.132 OAL