The M-90 has a capacity of 900 rounds, all loaded in a single, continuous belt, and fires in minimum bursts of 3 rounds. The entire 900-round belt can be emptied in significantly less than one minute. The weapon has three barrels, and is exceedingly heavy, slowing the user down while the weapon is readied. It fires armor-piercing rounds at an extremely high rate of fire, making it effective against small, fast-moving, hard-to-hit targets as well as durable, armored targets that smaller weapons may be ineffective against.