16:1 SHS gearset, nukefet mosfet, 11.1 Lipo battery, new piston head, zci 30 tpa motor, m150 and stock spring, 3 mid caps,1 high cap, RA gearbox shell, flat hoped, cost over 1k for everything new. Total gearbox overhaul so the gun shoots well over 20 rps and 430 fps. Bipod, grip, and sight included trade for a hpa setup or glock