Has many upgrades rebuilt from a gg. Changers parts would include G&G cylinder G&G gears Custom wiring, wired to deans Dboys V2 gearbox Shell Really good airseal Corrected AOE G&G keymod rails MBUS stock Element Hop Up ICS High Torque motor ICS flip up sights Stock Krytac barrel Has good trigger response only prob is it is currently only able to fire on full auto but safety does work. Looking for offers. Sold as is !