Best airsoft pistol brand. 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)