Pump up the plinking fun with the Umarex NXG Pump Shot CO2-powered pump-action BB gun. This youth-sized BB plinker holds 10 .177 caliber BBs in its drop-free rotary magazine and is fired like a traditional pump-action shotgun. Power comes from a single 12-gram CO2 cartridge that is housed in the grip. Expect velocities for the BBs to be at the 490 FPS range.