Fully built gearbox. Has been completely overhauled. Not a stock part left in it. Built by a tech from airsoftmechanics. This is my nicest, and best shooting build. I don’t have a parts list, and I won’t take the gearbox apart. I will list everything I can see. Parts list: Spectre mosfet 6.03 rhoped polished barrel Pro win hop up Flat face trigger Almost full cylinder New nozzle New spring New piston New gears, I believe are 13:1 or 16:1 High torque motor Wired to rear with deans connectors Gun was built to shoot 400 fps with .2’s at about 25 rps. I don’t have a chrono to confirm. Trigger response is very crisp. The gun was built for indoors and accuracy. Comes as shown, with what’s shown. Asking $550 plus actual shipping costs. NO AIRSOFT RELATED TRADES, PROBABLY NO TRADES AT ALL. I have batteries and magazines available for purchase as well.