All internals are new and never used. Custom M4 mag adapter. Upgraded by Jason Terry “Gun Doctor” NUTS AND BOLTS Tokyo Marui AUG Lonex Hop up Rhop Modify bucking with flat nub Black Python Tight bore inter barrel Gate Mosfet Hard Prometheus piston head Shs piston Shs high gears 12:1 ratio Shs high torque motor Shs modify ceramic bushing Matrix gearbox 3D printed m4 adapter fixed on gun Shoots at 400 FPS Shoots very well cool gun to have and you can use your m4 mags and not the crappy AUG mags!