The CO2 powered SIG MCX Air Rifle delivers 30 rounds of rapid-firing, simulated SIG MCX performance and handling for more realistic, economical training and practice any time, any place. Chambered in .177 pellet, features include an 18" rifled steel barrel, synthetic handguard, picatinny rail, tactical front grip, flip-up front and rear sights and more. Brand Sig Sauer Airguns Category CO2 Cartridges Model CO2 Caliber 177 Action Semi-Auto OAL 34.75" Ammo Type Pellet Trigger Pull Weight 7 lbs