Ruger Mark IV Pellet Pistol .177 caliber pellets Breakbarrel Spring piston Rifled barrel Single-shot Single-stage trigger One-stroke cocking mechanism Max. velocity up to 360 FPS (with 7-grain pellet) Manual/automatic thumb safety Fiber optic front sight and adjustable rear sight Checkered/smooth grip panels Barrel length: 5.3" Overall length: 11" Weight: 3.15 lbs.