the action or process of smoothing the inside of a bore (bore, n.1 2a) in a metallic object, esp. the barrel of a gun.

The size or arrangement of the chambers (chamber, n. 9c) of a gun; the provision of chambers.

The fitting or adaptation of a firearm so that it may be fired by percussion (percussion, n. 4).

The winding of a bar into a coil for a gun; cf. coil, n.3 5. Also attributive.

The action of strengthening a person or thing (in various senses of reinforce, v.).

The furnishing of a gun with an action; a manner of doing this. Cf. action, n. 19d.

(See quot. 1881.)

Ordnance. The insertion of an inner tube or lining in the bore of a cannon; also, the process of shrinking an outer tube on an inner bore.

fashioning flints (for gun-locks, etc.).

The action or process of adjusting the sights of a rifle; the manner or position in which the sights of a rifle are set. Cf. zero, v. 2. Frequently…

sighting-in, the action of correcting the sights of a firearm, etc. Cf. sight, v.1 3b. North American.