G&G full metal and fully upgradeable reinforced V2 gearbox Everything is 100% compatible to G&G and Marui series AEG's Comes with G&G M4 450 round hi-cap magazine Adjustable hopup Removable, adjustable rear sight with weaver rail base for scope mounting Sling adapter Metal barrel assembly, gearbox, buffer tube, magazine, carrying handle, switch, pins 14mm negative threaded barrel. Works Perfectly fine and the charger is included.