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Insurgency: Sandstorm

"Extends 5.25 inch barrel to 8 inches and sets weapon into single-action mode, reducing rate of fire, increasing muzzle velocity, and allowing attachment of Bipod and 2.5x CT Scope upgrades."
— In-game description

The Sniper Barrel is a barrel attachment featured in Insurgency: Sandstorm. It can be used only on MR 73