SIG Sauer MCX Pellet Rifle Gen 2, Black .177 caliber pellets Semi-automatic 30-round Roto Belt pellet magazine Rifled steel barrel Max. velocity: 545 FPS Flat blade trigger Improved textured pistol grip Adjustable flip-up front and rear sights Long Picatinny optics rail M-LOK handguard Improved ergonomic buttstock Manual safety Barrel length: 17.7" Overall length: 34.7" Weight: 7.35 lbs. PCP model includes Air Venturi 13 cubic inch air tank, tank adapter, and buttstock CO2 model uses one 88- or 90-gram CO2 cylinder