: These require the user to pump a lever multiple times to compress air in an internal reservoir. The Daisy Powerline 880 is a popular example that can reach velocities up to 800 FPS. Realism and Safety Concerns
The internal mechanism, or "powerplant," of a BB gun determines its velocity and use case. Most traditional rifles, such as the Daisy 499B Champion , use a system where a cocking lever compresses a spring that, when released, drives a piston to create a burst of air. BB GUNS
: Many modern replica handguns, like the Umarex Legends P08, use disposable 12g CO2 cartridges. These allow for rapid-fire or even full-auto capabilities, though performance can drop as the cartridge empties. : These require the user to pump a