CO2 Power:ed BB guns are great fun for plinking and target shooting. Check out this HandK USP. It holds 22 rounds in a heavyweight magazine that also houses the CO2 cylinder that Power:s this BB pistol. It has an ambidextrous magazine release, integrated accessory rail and realistic hammer movement. This is a great practice pistol for 9mm USP owners. For just pennies a shot you can shoot for hours. UMAREX holds the worldwide exclusive HK-trademark and exterior design copy license for use with this UMAREX product, granted by HK, Inc., U.S.A. Displays the Hand HK logo. Authentic look and feel. Drop out magazine holds 22 BBs and one 12g CO2 capsule. Ambidextrous magazine release lever. Integrated accessory rail. Realistic hammer movement. Caliber 0.177. Action: Semi-Auto (repeater). Power: CO2. Capacity: 22. Barrel Length: 4. Brand: Heckler and Koch. Safety Type: Manual. Rear Sight Type: Notch - Fixed. Front Sight Type: Blade - Fixed. Barrel Type: Smooth. Ammo Type: BB. Total Length in Inches: 7.5. Velocity- FPS: 400.