King Arms Full Metal Fully Licensed Colt M4A1 Carbine Airsoft Gas Blowback Rifle

Magazine Capacity: 50 Rounds Firing Mode: Semi Automatic, Full Automatic and Safety Hop-up: Adjustable Overall Length: 770mm (850 with stock extended) Inner Barrel Length: 368mm. The King Arms M4 GBB uses AEG type tight bore inner barrels. Gas: Green gas, propane adapter, co2 magazine. System: Open bolt Action: Gas blowback Caliber: 6mm / High grade bbs recommended. Muzzle Velocity: 330~380 FPS Package Includes: Gun, Magazine Range: 70~140 feet Materials: Aluminum, Nylon Fiber Polymer Length: 770mm-850mm