Advanced Combat Optical Gunsight

The Advanced Combat Optical Gunsight (ACOG) is a commonly used scope for rifles, mainly automatic rifles. Sniper rifles generally have special, even hand-crafted scopes that can zoom in excess of 10x; ACOGs generally zoom 2x-4x. One weapon that comes fitted for the ACOG attachment is the M4 Carbine; another, less commonly fitted weapon is the M16A3.