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Popgun

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A popgun (also spelled pop gun or pop-gun) is a simple pneumatic toy weapon that uses compressed air (usually via piston action, though sometimes via spring pressure) to expel a lightweight projectile, typically a small tethered or untethered object, producing a distinctive popping sound. Popguns are among the earliest known mechanical toys based on air pressure and have been documented in Europe since at least the 17th century. Unlike pneumatic air rifles intended for target shooting, popguns are designed for low-velocity play, emphasising mechanical feedback and acoustics.