SIG Sauer P320 Spectre Comp Blackout CO2 Pellet Pistol .177 cal pellets 20 round drop free magazine Power source: One 12g CO2 cartridge Velocity: 340 FPS with 7.71 grain pellets Metal slide Rifled barrel Full blowback Semi-auto Textured grip Flared mag well Mag capacity: 20 rounds Overall Length: 8.5" Barrel Length: 4.6" Trigger weight: 4.5 lbs Weight: 2.31 lbs Accessory rail Fixed sights Optic ready Includes one magazine Tech Note: The screws on top of the optics rail are cosemetic. If you want to add the Sig Air Red Dot, you need to remove the two screws holding in the rear sight AFTER you take the slide off of the pistol.