Swivel gun
SMALL CANNON MOUNTED ON SWIVEL FOR EASE AIMING
Swivel guns; Peterero; Paterero; Pederero; Swivel cannon
The term swivel gun (or simply swivel) usually refers to a small cannon, mounted on a swiveling stand or fork which allows a very wide arc of movement. Another type of firearm referred to as a swivel gun was an early flintlock combination gun with two barrels that rotated along their axes to allow the shooter to switch between rifled and smoothbore barrels.