Realistic electric blowback design Built-in spring detention function Full metal receiver for a heavyweight, realistic feel Custom keymod style front rail system Full length upper rail perfect for optics Polymer flip-up front and rear sights Ergonomic pistol grip Adjustable stock with integrated QD sling mounting point Ambidextrous charging handle gives the gun an aggressive look Full metal ICS split gearbox for easy maintenance and upgrades Compatible with 11.1v LiPo batteries Length: 700mm-795mm, Adjustable Weight: 2590g Inner Barrel: 263mm Magazine Capacity: 300rd Hi-Capacity. Works with Matrix, Tokyo Marui, ICS and other compatible M4 / M16 Series Airsoft AEG Magazines Muzzle Velocity: 380~400 FPS (Measured with 0.20g BBs) Thread Direction: 14mm Negative Gearbox: Ver 2 Full Metal ICS Split Type Motor: Long Type Fire Modes: Semi/Full-Auto, Safety Battery: 11.1v Small Stick Type LiPo recommended (Battery not included. Wired to stock with Small Tamiya connector) Hopup: Yes, Adjustable