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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 Barrel class attachment featured in Call of Duty: Modern Warfare and Call of Duty: Warzone.

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