M-4 commando mortar

[1] As with other mortars of this type it is intended for rapid use over short ranges as a fire support weapon.

It has a lanyard operated trigger mechanism in the breech which allows it to be carried loaded with a bomb, unlike other mortars that have fixed firing pins.

The lack of a bipod means it is not as accurate as a conventional mortar and is unsuitable for sustained fire use.

The sighting system incorporated in the handle consists of a pair of curved spirit levels one to indicate that it upright in the lateral plane and the other indicates the range with a charge table.

[2] It uses the M-61 series of bombs in high explosive, smoke, illumination and practice versions.