-Quick release design with integrated jump. -Recoil, slide lock after firing the last bullet. -RMR scope mount plating is included in the packing list. -Metal parts: barrel, gear, piston ladder, front and rear sights, dust cover, magazine base, magazine release button and slide lock release button. Features:1. Quick release and quick group, empty chamber stop2.Material: Nylon+metal 3.Firing mode: Semi-automatic/electric4.Firepower: 220 FPS5.Spring type: 1.1mm6.Ammunition type: 7-8mm gel ball or 6mm BB7.Size: 17*13cm Packing list:1* VPS9k gel gun1* Magazine with 11.1v battery1*USB charging cable1*10000 Gel ball or 1000 BB bullets