This is the Japan TOP electric shell ejecting system that is made by a Chinese brand called Sijun. The receiver, rail are made of polymer, small parts are metal. It shoots small nerf darts and 7-8mm gel balls, it can be converted to shoot 6mm bbs. Comes with two magpul style magazines (30rounds capacity) and 60 pieces shells. It can shoot in semi and full auto, runs on 11.1 lipo battery, connector has been converted to deans. DM for videos and other information.