SIG Sauer MPX Pellet Rifle Gen 2, Black .177 caliber pellets Semi-automatic 30-round Roto Belt pellet magazine Rifled steel barrel Max. velocity: 450 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: 8" Overall length: 25.75" Weight: 6.2 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