The subject of this article appears in Call of Duty: Modern Warfare (2019) The subject of this article appears in Call of Duty: Warzone

"Designed to better hold down positions, this longer barrel improves muzzle velocity, range, and accuracy. Additional weight hinders mobility."
— In-game description

The M91 Heavy is a barrel attachment featured in Call of Duty: Modern Warfare and Call of Duty: Warzone. It is uniquely available to the M91 light machine gun.

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