An armor plate or shield attached to an armored fighting vehicle's gun, protecting the opening through which the weapon's barrel projects from the hull or turret armor.

A gun without serial numbers that cannot be easily tracked, especially a home-made gun built with non-registered, partially finished or 3D printed components.

(simile) Surely; with certainty.

Alternative form of gunstock

(firearms, colloquial) A pocket pistol, especially one of a particularly small caliber.

plural of mouse gun

(US, military, slang, derogatory) The FP-45 Liberator, a crude, cheaply-made single-shot pistol.

plural of Woolworth gun

a large gun or cannonlike structure capable of launching an object into space.

A pop gun (kind of toy gun)