SIG Sauer SIG AIR MPX Spring Powered AirSoft Rifle Caliber: 6mm Velocity: 280 FPS 3-position polymer stock Injection molded polymer construction Spring powered firing action 1:1 full size replica 500 round drop free magazine Flip-up front and rear sights Removable 3-position adjustable stock included 20mm M1913 Picatinny rails for supreme accessorize options Ambidextrous safety lever Familiar AR-pattern controls allows for easy cross-training