Advanced Combat Optical Gunsight
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The Advanced Combat Optical Gunsight (normally pronounced ACOG) is a commonly used scope for rifles, particularly tactical and assault rifles, such as the automatic M-16. In contrast to Sniper rifles, which generally have special or hand-crafted scopes that can magnify in excess of 10x, ACOGs generally only possess magnification of 2x-4x. Commonly fitted with the ACOG are the M-16, the similar AR-15, the M4 Carbine, and many tactical/close quarters battle rifles.