Krytac gearbox, upgraded slightly, reshimmed JG red motor VFC lower w/ Krytac upper Details: Added a stainless full cylinder New o-ring on the piston head New spring (M120) Little more sorbo to make aoe perfect Reshim it Aluminum air nozzle JG Red w/ Krytac Pinion Shoots a hair under 400 FPS. $40 for just body, $80 for just the gearbox/motor/grip, or trade an ICS split gearbox and receiver set+$50 for all.