Specifications Operation: Gas BlowbackBuild: Metal Receiver, Outer Barrel, Stock, Flash Hider / Polymer Handguard, Pistol GripFiring Modes: Semiautomatic, Fullautomatic, W/ Functional SafetyMuzzle Velocity: 330 - 350 (W/ 0.20G Bbs)Magazine: 40Rd Gas MagazinePropellant: Green GasInner Barrel Length: 215.9 MmInner Barrel Diameter: 6.05 MmHopup: AdjustableWeight: 8 LbsOverall Length: 20 In. / 29 In. (Foldable / Extended)Ammo Type: Seamless 0.20G Or Heavier (0.23G, 0.25G, 0.26G, 0.28G, Etc) Bbs. For Maximum Performance And Accuracy, Tactical Sport Recommends Goldenball Proslick Bbs Which Carry Perfect Spherical Consistency And Density, Available At Tactical Sport For The Lowest Price On The Market, Guaranteed.Package Includes: Airsoft Rifle, Gas Magazine, Speedloader, Instruction ManualColor: BlackFeatures KWA Force Velocity Gas System Full Metal Receiver, Barrel, Stock Foldable Metal Skeleton Stock Easyaccess Hopup Unit Realistic Field Stripping Integrated Ak Side Rail Mount Adjustable Front And Rear Sights Shoots In Both Semi And Full Auto 40Rd Green Magazine Included