Pen gun

Homemade pen guns (Museum of the History of Donetsk militsiya).

A pen gun is a firearm that resembles an ink pen. They generally are of small caliber (e.g., .22 LR, .25 ACP, .32 ACP, .380 ACP caliber, etc.) and are single shot. Early examples of pen guns were pinfired, but modern designs are rim or centerfire. Some pen guns are not designed to fire regular cartridges, but rather blank cartridges, signal flares, or tear gas cartridges.

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