The Only Thing You Have to Pump on a Gas Engine-Powered Nerf Blaster Is Fuel
Since they're primarily designed for kids Nerf's dart blasters, even the battery-powered ones, aren't actually very powerful. It's why there are entire communities of Nerf modders out there, but Peter Sripol might be the first to upgrade a Nerf blaster with an internal combustion engine. The only thing you really need...