Armed Assault Wiki

The ACOG (full name: Advanced Combat Optical Gunsight) is a series of riflescopes featured as weapon attachments in both ArmA: Armed Assault and ArmA 2.

ArmA: Armed Assault

Faction Icon-side-blufor.png U.S. Army
Type Riflescope
Magnification 4.01x
Zeroing range 100 m (fixed)
Variants None

The ACOG is used exclusively by the U.S. Army in ArmA: Armed Assault.


The ACOG is a low-powered riflescope used by U.S. military forces. It features a backup ironsight which can be swapped to for use in close quarters.

It is only available on two platforms:

  • M4A1 carbine (5.56 mm)
  • M16A4 assault rifle (5.56 mm)

The ACOG's reticle markings are optimised exclusively for 5.56 mm NATO. It is accurate for targets at distances of up to 600 metres (at the lowermost marking).

The default zeroing for both "modes" is always levelled at 100 m and cannot be adjusted.


  • Although both the M4A1 and M16A4 can swap to the ACOG's ironsight, the user will only switch to an alternate "muzzle" in the same way as swapping to fire underbarrel grenade launchers; not an actual backup sight.
  • Prior to Patch 1.05, the ballistics profile of the 5.56 mm round did not match the markings on the ACOG's reticle and caused all shots beyond ranges of 400 metres to go off-centre.


ArmA 2

Faction Icon-side-blufor.png USMC
Icon-side-blufor.png U.S. Army
Icon-side-blufor.png British Army
Icon-side-blufor.png ACR
Type Riflescope
Magnification 4.01x
Zeroing range Variable; refer to each model for their respective ranges
Variants TA01NSN, TA31RCO, TA31F-RMR
Arma 2 logo.png


ArmA II BAF Logo.png

ArmA II ACR Logo.png

The ACOG (alternately RCO) is used by several BLUFOR factions in ArmA 2.


Unlike in Armed Assault, the ACOG is now available in three separate models designed for use with either 5.56 mm or 7.62 mm firearms:


The TA01NSN is considered as the "basic" model of the ACOG. It is available on the:

  • M4A1 carbine (5.56 mm)
  • M4A3 carbine (5.56 mm)
  • Sa-58V assault rifle (7.62 mm)

The primary optic and its backup ironsight always have fixed zeroing ranges. However, the range set will differ depending on the weapon it's being mounted on. In the case of the M4A1, both the primary and secondary optic are fixed to 100 m.

The primary optic's zeroing for the M4A3 on the other hand, is fixed at 300 m while for the ironsight it is 100 m. On the Sa-58V, the primary optic has a zeroing of 100 m instead while the backup ironsight is fixed at 300 m.

The reticle markers are mainly optimised for the 5.56×45 mm NATO round. Starting at the tip of the illuminated chevron (centre of the reticle), the reticle will be accurate for targets located at ranges of 300 metres.

This then extends to 800 metres for the lowermost marking. Each step represents a rise in 200 metre increments.


The TA31RCO is functionally identical to the regular TA01NSN and features two "modes"; the zoomed-in scope itself and a backup sight. However, it should be noted that the latter "mode" isn't actually an ironsight, and simply has the user aim via the fiber-optic tube.

It is solely available on one weapon platform:

  • M16A4 assault rifle (5.56 mm)

It utilises the same reticle as the TA01NSN and is ranged for the same distances. The TA31RCO is always set to a fixed zeroing of 100 m.


Premium content logo.png
This is a premium asset that requires ownership of the Operation Arrowhead expansion pack.

Unlike the TA01NSN, the TA31F-RMR features a top-mount reflex sight for use in close quarters. It was added with the release of the Operation Arrowhead expansion pack.

It is available on the:

The zeroing for both the primary optic and backup RDS are always fixed at 300 m. The reticle markings are ranged for targets starting at 300 metres at the tip of the illuminated chevron (centre of the reticle) and up to 800 metres at the lowermost marking. Each step rises in 200 metre increments.


  • Black: Standard matte black finish available to TA31RCOs and TA31F-RMRs.
  • Grey: Dark grey paint finish. Exclusive to USMC TA01NSNs.
  • Desert: Desert camouflage paint finish. Exclusive to TA01NSNs utilised by Czech special operations.


  • Following the latest Steam version patches, TA31RCOs were finally given a backup sight mode. Its reticle was also changed and is now visually identical to that of TA31F-RMRs (rather than reusing its Armed Assault reticle).
    • However, the patch has also strangely applied the same reticle to TA01NSNs mounted on the M4A1, M4A3 and Sa-58V. While appropriate for the 5.56 mm-chambered M4A1/M4A3, it makes very little sense for the Sa-58V to share the TA31F-RMR's reticle as the latter is chambered to fire the 7.62×39 mm round which has vastly different ballistics.
    • It is also now possible to utilise night vision goggles while simultaneously aiming through any of the scopes (for both backup and scope "modes").
The information below details unused, pre-release or removed content.
  • Unused icon for the ArmA 3 ACOG.

    An updated port of the TA31F-RMR variant would have supposedly made a comeback in ArmA 3 as a usable attachment (Classname: optic_ACOG).
    • Prior to their removal following the Apex expansion, textures for the ACOG, leftover text strings, as well as an unused icon could be found within the game files (the model itself did not exist).
    • Trijicon was also credited on the game's loading splash screen and credits for the campaign's first episode.
    • However, it is not clear as to why the ACOG was not included in the final game, nor why its leftover assets were removed following Apex's release.


External links

See also

Optical sights of comparable role and configuration

Weapon attachments of ArmA: Armed Assault
Red dot sights Aimpoint
Riflescopes ACOG
Sniper scopes PSOSniper
Suppressors Suppressor
Weapon attachments of ArmA 2
Non-magnified sights CCOHolosightKobraZD-Dot
Riflescopes ACOGMk4 CQ/TSpecter
Telescopic sights 1P78M145SUSAT
Sniper scopes PSOSniper
Aiming devices Laser Pointer
Illumination Flashlight
Suppressors Suppressor
Operation Arrowhead | British Armed Forces | Army of the Czech Republic