Armed Assault Wiki

The ARCO (full name: Advanced Rifle Combat Optics) is a low-powered riflescope used by both CSAT forces and Viper units, along with Russian Spetsnaz operatives in ArmA 3.


The ARCO has a fixed zeroing range of 300 m for its thermally transparent (i.e. thermally hot targets will be visible in thermal vision mode) primary scope and a magnification strength of 2x.

It uses a crosshair reticle with an illuminated chevron, but the reticle will not be visible in thermal vision. It is optimised for use with 6.5 mm-chambered firearms (both caseless and cased). This includes:

  • The AK-12 series of modular rifles (7.62 mm; all sub-variants)
  • CMR-76 bullpup marksman rifle (6.5 mm)
  • Katiba bullpup rifle (6.5 mm)
  • Mk200 light machine gun (6.5 mm)
  • The MX series of modular rifles (6.5 mm; all sub-variants)
  • The Promet series of modular bullpups (6.5 mm; all sub-variants)
  • Type 115 special purpose rifle (6.5 mm-chambered rifle component only; does not apply to the underbarrel .50 BW anti-materiel rifle module)

The ARCO has a backup collimator sight fitted above the primary scope for use in close quarters. The backup collimator is set to a zeroing of 200 m and is also thermally transparent.


  • ARCO AK: Unique variant optimised specifically for the AK-12's 7.62×39 mm cartridge. Aside from its reticle, its model remains identical to regular non-AK ARCOs.


  • Black: Black paint finish. Used by both Mediterranean and North African CSAT forces.
  • Sand: Desert sand paint finish. Utilised by Viper Team operatives.
  • Green Hex: Tropical Hexacam camouflage pattern. Exclusive to Pacific CSAT marksmen.
  • Arid: Desert camouflage pattern.
  • Lush: Woodland camouflage pattern. Exclusively utilised by Russian Spetsnaz operatives.


  • The ARCO is seemingly based on the real-life "SpecterOS 4x", a combat optical sight made by Canada-based company ELCAN Optical Technologies.[1]
    • The top mount sight on the other hand appears to be based on the "DOCTERsight II plus" manufactured by DOCTER Optics of Germany.
  • The Black and Green Hex versions were not originally available and were only included with the Apex expansion.[2] Meanwhile, the dedicated AK scope variants and Arid/Lush finishes would not be added until the Contact expansion pack's release.[3]
  • After the Marksmen DLC's release, the ARCO's collimator sight was upgraded to make use of the then-new collimator tunnelling effect[4] for its reticle (as part of Game Update 1.42).[5]
  • When depth of field was enabled, the reticle markings on the primary scope would become extremely blurry and difficult to read under certain lighting conditions. This was eventually addressed in a hotfix to Game Update 2.02 which corrected the ARCO's model to use radial blurring instead (separate from the game's DoF settings).[6]
The information below details unused, pre-release or removed content.
  • When ArmA 3's Alpha was initially released, the ARCO functioned as an ArmA 2-style 2D scope rather than 3D. This was changed after the Beta's release to its current 3D-style model.[7] Though it is no longer used, its original 2D-style scope reticle is still hidden in the game files[8] and can be restored with a custom addon.



  1. Pettry, D et al. 2011, Raytheon ELCAN Optical Technologies: Specter brand Optical Combat Sights, Raytheon ELCAN Optical Technologies, viewed 5 March 2024, <>. (archived link)
  2. Kovařič, V 2016, SPOTREP #00058, Arma 3, viewed 22 May 2023, <>.
  3. van 't Land, J.J. 2019, SPOTREP #00089, Arma 3, viewed 22 May 2023, <>.
  4. van 't Land, J.J. 2015, SITREP #00098, Arma 3, viewed 15 October 2023, <>.
  5. van 't Land, J.J. 2015, SPOTREP #00040, Arma 3, viewed 15 October 2023, <>.
  6. van 't Land, J.J. 2021, SPOTREP #00097, Arma 3, viewed 22 May 2021, <>.
  7. van 't Land, J.J. 2013, SITREP #00014, Arma 3, viewed 30 November 2023, <>.
  8. ARMA 3 2013 [Video Game], Bohemia Interactive a.s., \a3\weapons_f\acc\reticle_arco_f.p3d

External links[]

See also[]

Optical sights of comparable role and configuration[]

Weapon attachments of ArmA 3
Collimators ACO (SMG) • MRDYorris J2
Holographic sights Mk17 Holosight (SMG)
Sniper scopes AMSDMS (Kir, Old) • KahliaLRPSMOS
Thermal/Night vision TWS (MG) • NightstalkerNVS
Aiming devices IR Laser Pointer
Illumination Flashlight
Muzzle SIMCOM AdapterSound Suppressor (5.56 mm, 5.7 mm, 5.8 mm, 6.5 mm, Stealth, 7.62 mm, .338, 9 mm, 9.3 mm, .45 ACP)
Weapon mounts Bipod
(Parenthesis) denote variants.
Marksmen DLC | Apex DLC | Contact DLC