I built this about a month ago. It is almost completely new and fires about 350 - 400+ FPS with .20 bbs on 120 PSI. PARTS LIST: SLIDE: Airsoft masterpiece infinity ver.2 OUTER BARREL: Airsoft Masterpeice .45 ACP threaded barrel VER.2 BUCKING: Maple leaf Decepticons 70° RECOIL SPRING: AIP 140% HAMMER SPRING: AIP 140% TRIGGER: Airsoft masterpeice SV puzzle MAGWELL: Airsoft masterpiece infinity AA IPSC Type1 NOZZLE: CowCow CNC Aluminum High flow HOUSING: Airsoft masterpiece aluminum blowback SIGHT/HANDLE: AIP cocking handle Ver.2 TRIGGER BASE: Airsoft masterpiece aluminum puzzle trigger base