(informal) A tattoo machine.

(historical) A firearm that has a needle-like firing pin.

(chiefly historical) A very large shotgun used in the 19th and early 20th centuries for shooting large numbers of waterfowl for commercial harvesting operations and private sport.

A firearm, such as a shotgun or rifle, which is fired while braced against the shoulder.

(mathematics) In the Conway's Game of Life cellular automaton, any pattern that "fires" out gliders.

Any gun-shaped device used to apply glue. / A hot glue gun

(firearms) A British machine gun of various calibres used by the British army from 1889 until World War II.

(military) Obsolete form of big gun. / (figuratively) A person of great importance or talent.

(historical) A kind of breech-loading steel cannon.

Alternative form of Quaker gun