Features: - Optic Ready Slide with Removable Rear Sight Plate - Pistol Uses Both CO2 or Green Gas Magazines (Alternate Magazines Sold Seperately) - Field Strippable with Similar Balance and Weight As the Real M17 - Metal Slide Construction with Full Blow-back Action - (1) 21rd Metal Magazine - Replica of the US Army M17 Pistol - Up to 410fps (CO2) 320fps (GG) Comes with a Magazine of each Variation, used only a few times. Tested and works great.