Users
- Argentina:GEOF (Grupo Especial de Operaciones Federales), Grupo Halcón.
- Australia: Australian Army.
- Colombia: is used by all armed forces in Colombia.
- Finland: Finnish Defense Forces.
- Germany: GSG 9 Federal Police Special Forces
- Iraq: Iraqi Security Forces
- Israel: Israel Defense Forces.
- South Korea: South Korea Forces
- New Zealand: New Zealand Army
- Norway: Norwegian Army
- Saudi Arabia: Saudi Arabian Army.
- South Africa: Used by South African National Defence Force, South African Police Service Special Task Force
- Spain: Spanish Army, standard sight for the Heckler & Koch MG4.
- Tunisia: Tunisian Army
- Turkey: Turkish Army
- United Arab Emirates: UAE Army.
- United Kingdom: British Army and the Royal Marines
- United States: United States armed forces (see below), various law enforcement agencies.
The United States Army and Marine Corps both field the Trijicon TA31RCO ACOG, a 4x magnification model with 32mm optics (4×32), with specially designed ballistic compensating reticles that are fiber optic & tritium illuminated, for the M4 carbine and M16A4 rifle. This sight is designated the M150 Rifle Combat Optic in Army service and AN/PVQ-31 Rifle Combat Optic in the Marine Corps. After an October 2005 evaluation, the USMC fielded 115,000 ACOGs so that every rifle and every carbine in the Marine Corps inventory would be equipped with one.
The TA01NSN, a 4x32 ACOG with only tritium night illumination and backup iron sights, is included the Special Operations Peculiar MODification (SOPMOD) kit for the M4A1 carbine used by Special Operations personnel to configure their weapons to individual preferences and mission requirements. Other Trijicon models have also seen service after being purchased at the unit level.
Read more about this topic: Advanced Combat Optical Gunsight