"The rugged ACOG is the preferred gunsight of US forces and police sniper units." — In-game description
The ACOG Scope is a weapon attachment featured in Tom Clancy's Rainbow Six: Vegas. The ACOG replaces a weapon's default iron sights and adds a 4x scope that the player is able to view through. The ACOG Scope can only be equipped to assault rifles in-game. The attachment cannot be equipped to light machine guns, sniper rifles, shotguns, and submachine guns.
Note: If a player is looking through an ACOG Scope behind cover in third person view, the player's whole view is zoomed in with the sight's corner zooming in to the ends of the screen.