Gun - Wikipedia

A gun is a tubular ranged weapon typically designed to pneumatically discharge projectiles that are solid (most guns) but can also be liquid (as in water guns/cannons and projected water disruptors) or even charged particles (as in a plasma gun) and may be free-flying (as with bullets and artillery shells) or tethered (as with Taser guns

Gun Accessories - TV Tropes

NERF N-Strike blasters have Tactical Rails for you to pimp out customize to your heart's content with. Among the numerous Tactical Rail Accessories include a "laser" sight, flip-up iron sights, the NERF version of a grenade launcher, barrel extensions, and for some blasters, interchangeable removable stocks.