Walther PDP Compact CO2 BB Pistol .177 caliber Drop-free magazine Magazine capacity: 16 BBs Max. velocity: 375 FPS Double-action trigger Fixed metal slide Textured grip Fixed front blade sight Windage-adjustable rear notch sight Under-muzzle Picatinny accessory rail Accepts separately available optics plate adapters Barrel length: 4" Overall length: 7.24" Powered by a 12-gram CO2 cartridge Piercing tool for CO2 cartridge integrated into backstrap