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|No. of positions||4|
|Position 1|| Helmsman|
|Position 2||45mm gun|
|Position 3||12.7mm machine gun|
|Position 4||12.7mm machine gun|
The MO-4 is a small Soviet guard ship and submarine chaser.
The MO-4 was the most numerous type of all MO-class guard ships. Although it had no armour but with a wooden structure instead, the MO-4 was capable to absorb heavy damage while staying afloat. Its powerful engines made it fast enough for anti-submarine, escort and patrol duties. Its main armaments were the two 45mm semi-automatic guns which were able to fire armor piercing rounds. One was mounted on each end of the boat. The MO-4 was also equipped with depth charges and two DsHK machine guns.