CO2 powered BB guns Air Pistol are great fun for plinking and target shooting. Check out this HK USPAir Pistol. It holds 22 rounds in a heavyweight magazine that also houses the CO2 cylinder that powers this BB pistol (CO2 NOT included). It has an ambidextrous magazine release, integrated accessory rail. For just pennies a shot, you can shoot for hours. A Cost Effective Target Shooting Solution.
Key Features:

• High Quality Air Pistol. The HK USP CO2 .177 BB Air Pistol is the perfect air pistol for target shooting and backyard plinking.
• Drop Free Magazine. This high quality, drop free magazine holds 22 rounds of .177 caliber BBs.
• Great fun for plinking and target shooting.
• Powered by economical and easy-to-find 12-gram CO2 cartridges (CO2 NOT included)

Umarex HK Heckler & Koch USP .177 Caliber CO2 BB Non-Blowback Air Pistol Specifications:

• Action: Double
• Power Source: CO2
• Caliber: .177 (4.5 mm)
• Capacity: 22 rounds (BBs)
• Velocity: 400 FPS
• Sights: Fixed
• Safety: Manual
• Weight: 1.8 lbs.
• Overall length: 7.5 in.
• Barrel length: 4.5 in