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

"Heavy duty extended barrel extends muzzle velocity and range to the max, but hinders mobility."
Gunsmith description

The 400mm Stainless Steel is a Barrel-class attachment featured in Call of Duty: Modern Warfare and Call of Duty: Warzone.

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