The final lap of a race, in which a gun is fired when the race leader begins the lap / (figuratively) The final stages of something

(nautical) The deck on an armed ship (man-of-war) on which the guns are placed.

plural of Rodman gun

Any of a series of heavy columbiads with a curved bottle shape, designed to fire both shot and shell, and used in the era of the American Civil War.

plural of Armstrong gun

plural of piercing gun

A device designed to pierce earlobes by driving a pointed starter earring through the lobe.

plural of hired gun

plural of glue gun

(transitive) To equip with additional guns or more powerful guns.