« | The Mk20 is a gas-operated rotating bolt, selective-fire weapon, which was designed as a highly moddable weapon. Its design and front ejection system allows true ambidextrous use. Two other variants of Mk20 exist. The Mk20C comes with a shorter barrel suitable for close combat and the Mk20 EGLM comes with an enhanced grenade launching module. Field Manual[1]
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The Mk20 is a 5.56 mm bullpup assault rifle used by the AAF, Altian government Loyalists and in limited numbers with FIA guerillas in ArmA 3.
Overview[]
The Mk20 is a gas operated, selective-fire bullpup assault rifle that is chambered to fire the 5.56×45 mm NATO round.
It can only load 30-round STANAG magazines, and can attain a rate of fire of up to ~ 857 rounds per minute[CfgWp 7][Formula 1] with a muzzle velocity of 900 m/s.[CfgWp 8] The top[CfgWp 9] and side[CfgWp 10] rails support being mounted with accessories while the muzzle can be fitted with 5.56 mm sound suppressors.[CfgWp 11]
The Mk20 serves as the standard-issue service rifle of the AAF, and is also used by FIA marksmen as a stand-in for heavier battle rifles. Similar to the TRG-21, it is also a bullpup weapon that is ideal for close quarters thanks to its compact layout.[CfgWp 5]
Compared to the TRG-21, the Mk20 has a slightly lower muzzle velocity of 900 m/s[CfgWp 8] as opposed to the TRG-21's 920 m/s[CfgWp 12], but the Mk20's recoil is a little easier to manage and it has a higher ROF of 857 RPM versus the TRG-21's 750 RPM.[CfgWp 7][Formula 1]
However, just like the TRG-21, the Mk20's usage of 5.56 mm ammunition results in poorer performance at long range compared to other assault rifles that are chambered in larger calibres such as the MX/Promet's 6.5 mm. Although 5.56 mm still remains viable at close-medium ranges (<300 metres) since damage drop off is not a concern at these distances, the same cannot be said for targets that are at distances beyond ~ 400 metres who are wearing heavy plate carriers.
Due to the 5.56 mm round's higher air drag[CfgAm 1], its damage drop off will be quicker, necessitating that a Mk20 user land at least ~ 6-7 direct hits to the chest of an armoured target to score a kill. In contrast, an MX/Promet user will need only ~ 4-5 hits to inflict fatal damage.
Variants[]
Mk20C[]
- Main article: Mk20C
Mk20 EGLM[]

The Mk20 EGLM is a modified version of the baseline Mk20 rifle that has an underbarrel grenade launcher attached and a shorter, carbine length barrel.
As with its parent weapon, it is also chambered to fire the same 5.56×45 mm NATO cartridge while the grenade launcher can load and fire a variety of 40 mm grenades that range from lethal high-explosive (HE) to less-than-lethal (LTL) flares and non-lethal smoke shells.[CfgWp 20][CfgWp 21] The EGLM uses a red dot quadrant sight that can be zeroed up to a maximum distance of 400 metres.[CfgWp 22]
Due to the grenade launcher module, the Mk20 EGLM is heavier to wield by ~ 23%[CfgWp 15] and also has an increased inertia penalty of 0.5 as opposed to the baseline rifle's 0.4.[CfgWp 19]
Additionally, it should also be noted that the Mk20 EGLM's recoil is comparable to that of the Mk20C carbine and that its muzzle velocity is reduced (820 m/s) due to the barrel's length being cut.[CfgWp 23] This reduction to the barrel's length also affects the Mk20 EGLM's accuracy as its dispersion is now increased by ~ 22%.[CfgWp 13]
Ironsights[]

If an optical sight with a zeroing limit greater than 600 metres is attached onto the top rail (e.g. Nightstalker), the Mk20 will allow for an absolute maximum zeroing of 800 metres.[CfgWp 26]

The Mk20 EGLM's zeroing cannot be adjusted beyond 600 metres even if an optical sight with a zeroing limit greater than 600 metres is attached onto the top rail (e.g. Nightstalker).[CfgWp 29]

It uses a red dot reflex sight. By default, the sight uses a zeroing of 75 metres.[CfgWp 30]
Camouflage[]
- Camo: Digitised semi-fractal camouflage pattern. Standard finish used by all AAF, Loyalist and FIA Mk20s.
- Sand: Desert sand paint finish.
Ammunition[]
Ammo parameter | 5.56 mm NATO (Ball) | 5.56 mm NATO (Tracer) |
---|---|---|
Base damage value | 9[CfgAm 2] | 9[CfgAm 3] |
Aerodynamic friction | -0.0012[CfgAm 1] | -0.0012[CfgAm 4] |
Muzzle velocity (m/s) | 920 [CfgMa 3][note 1] Mk20: 900 [CfgWp 8][note 2] Mk20 EGLM: 820 [CfgWp 23][note 3] |
920 [CfgMa 4][note 1] Mk20: 900 [CfgWp 8][note 2] Mk20 EGLM: 820 [CfgWp 23][note 3] |
Expected velocity (m/s) | 920 [CfgAm 5][note 4] |
920 [CfgAm 6][note 4] |
Penetration depth (mm) | 11.999997 [CfgAm 7][Formula 2] Mk20: 11.7391275 [Formula 3][note 5] Mk20 EGLM: 10.6956495 [Formula 4][note 6] |
11.999997 [CfgAm 8][Formula 5] Mk20: 11.7391275 [Formula 6][note 5] Mk20 EGLM: 10.6956495 [Formula 7][note 6] |
Deflection angle (degrees) | 15°[CfgAm 9] | 15°[CfgAm 10] |
For grenade rounds usable with the EGLM, refer to its dedicated article here.
Both variants of the Mk20 can be loaded with up to six types of magazines.[CfgWp 31][CfgWp 32] All magazines share the same weight of 8[CfgMa 5] "mass" units and are available in either a Black or Sand colour finish.
These STANAG magazines are fully interchangeable with all 5.56 mm NATO-chambered assault rifles (SDAR/SPAR-16/TRG-21). However, the 150-round drums of the SPAR-16S cannot be fed into either variant of the Mk20:
5.56 mm 30rnd Reload Tracer (Yellow) Mag[]

30-round STANAG magazine loaded with a mix of 5.56 mm NATO ball and tracer ammunition.[CfgMa 6]
The last four rounds of the magazine will always emit visible yellow tracers.[CfgMa 7]
5.56 mm 30rnd Reload Tracer (Red) Mag[]

Alternate STANAG magazine that is also loaded with 5.56 mm NATO ball ammunition. Where it differs is its usage of red-coloured tracers as opposed to yellow.[CfgMa 8]
Aside from firing different coloured tracers, it remains statistically identical to the standard yellow tracer STANAGs (the last four rounds of the magazine will always emit red tracers).[CfgMa 9]
5.56 mm 30rnd Reload Tracer (Green) Mag[]

Alternate STANAG magazine that is also loaded with 5.56 mm NATO ball ammunition. Where it differs is its usage of green-coloured tracers as opposed to yellow.[CfgMa 10]
Aside from firing different coloured tracers, it remains statistically identical to the standard yellow tracer STANAGs (the last four rounds of the magazine will always emit green tracers).[CfgMa 11]
5.56 mm 30rnd Tracer (Yellow) Mag[]

Dedicated 30-rounder STANAG magazine loaded exclusively with 5.56 mm NATO yellow tracer ammunition.[CfgMa 12]
Aside from its tracer-exclusive loadout[CfgMa 13], this magazine is statistically identical to the standard mixed load 5.56 mm STANAGs.
5.56 mm 30rnd Tracer (Red) Mag[]

Alternate STANAG magazine loaded with red tracer ammunition instead of yellow.[CfgMa 14]
Other than its red tracer-exclusive loadout[CfgMa 15], this magazine is also statistically identical to the standard mixed load 5.56 mm STANAGs.
5.56 mm 30rnd Tracer (Green) Mag[]

Alternate STANAG magazine loaded with green tracer ammunition instead of yellow.[CfgMa 16]
Other than its green tracer-exclusive loadout[CfgMa 17], this magazine is also statistically identical to the standard mixed load 5.56 mm STANAGs.
Magazine compatibility[]
STANAG_556x45 | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Weapon name (Classname) |
5.56 mm 30rnd Reload Tracer (Yellow) Mag![]() |
5.56 mm 30rnd Reload Tracer (Red) Mag![]() |
5.56 mm 30rnd Reload Tracer (Green) Mag![]() |
5.56 mm 30rnd Tracer (Yellow) Mag![]() |
5.56 mm 30rnd Tracer (Red) Mag![]() |
5.56 mm 30rnd Tracer (Green) Mag![]() |
5.56 mm 30rnd Reload Tracer (Yellow) Sand Mag![]() |
5.56 mm 30rnd Reload Tracer (Red) Sand Mag![]() |
5.56 mm 30rnd Reload Tracer (Green) Sand Mag![]() |
5.56 mm 30rnd Tracer (Yellow) Sand Mag![]() |
5.56 mm 30rnd Tracer (Red) Sand Mag![]() |
5.56 mm 30rnd Tracer (Green) Sand Mag![]() |
Mk20 5.56 mm (Camo) (arifle_Mk20_F) |
✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
Mk20 EGLM 5.56 mm (Camo) (arifle_Mk20_GL_F) |
✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
Mk20 EGLM 5.56 mm (arifle_Mk20_GL_plain_F) |
✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
Mk20 5.56 mm (arifle_Mk20_plain_F) |
✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
Reaction Forces Creator DLC only | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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NOTE: The following table only applies if the third party-developed Reaction Forces Creator DLC is activated.
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Trivia[]
- The Mk20 and its sub-variants are based on the real-world "F2000" bullpup assault rifle designed by FN Herstal of Belgium. More specifically it is based on the "Tactical TR" model of the F2000[2], and it uses a "Tri-Rail" foregrip that was then-designed by Monolith Arms (now owned by Magpul Industries).[3]
- The Mk20's designation should not be confused with the real-life "MK20 SSR", a designated marksman rifle that is also designed by FN Herstal.
- The EGLM on the other hand, is based on FN Herstal's "GL1" grenade launcher module that was designed specifically for use on the F2000 family of bullpups.
- Unlike the TRG-21, the Mk20 was not originally available in the Alpha and was only later added with the Beta (specifically after Game Update 0.70).[4]
- Prior to Game Update 1.48, the Mk20's maximum zeroing was set to 1,000 m as opposed to its current 800 m. The patch lowered this to 800 m instead.[5]
- Originally, the user's left hand would clip into the model of the Mk20's underbarrel grenade launcher. This was fixed after the release of Game Update 1.56.[6]
- Sound effects for the Mk20's tails at certain distances were improved after the release of the Jets DLC (as part of Game Update 1.70's changes).[7]
- The patch also changed the sound effects for the Mk20's shell casing ejections.[7]
- The information below details unused, pre-release or removed content.
- Screenshots released during the pre-Alpha phase of ArmA 3's development indicated that the Mk20 was originally meant to be a NATO weapon.[8] By the time of the Alpha and Beta's release however, it was replaced by the MX.
- It should be noted that Sand-camouflaged Mk20s were not originally featured in the Alpha and were only added into the game with the Beta's release (as part of Game Update 0.74).[9] Given that they were prominently featured in pre-Alpha media[8], their omission from the Alpha's release remains a mystery.
Gallery[]
Major Gavras (left) and Lieutenant Dimitriou (right) on the run from NATO forces. Gavras is armed with the Mk20 EGLM while Dimitriou is equipped with the Mk20C. Promotional screenshot released during the pre-Alpha. Note the NATO infantrymen who are all armed with sand-painted versions of the Mk20 instead of the MX. |
Config/script references[]
CfgAmmo
CfgMagazines
CfgWeapons
Formulae
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Notes[]
- ↑ 1.0 1.1 This muzzle velocity value only applies to the magazine itself. The Mk20/Mk20 EGLM's initSpeed values (900 m/s and 820 m/s) take precedence over the magazine's initSpeed value (920 m/s) since their values are not defined as coefficients (the magazine's initSpeed is overridden as opposed to being multiplied).
- ↑ 2.0 2.1 This is the baseline Mk20 rifle's actual muzzle velocity. The weapon class initSpeed value (900 m/s) takes precedence over the magazine initSpeed value (920 m/s).
- ↑ 3.0 3.1 This is the Mk20 EGLM's actual muzzle velocity. The weapon class initSpeed value (820 m/s) takes precedence over the magazine initSpeed value (920 m/s).
- ↑ 4.0 4.1 Damage will be reduced if the projectile's velocity drops below this value.
- ↑ 5.0 5.1 This is the actual penetration depth of the 5.56 mm ammunition fired by the baseline Mk20 rifle. The weapon class initSpeed value (900 m/s) takes precedence over the magazine initSpeed value (920 m/s), affecting its penetration formula as a result.
- ↑ 6.0 6.1 This is the actual penetration depth of the Mk20 EGLM's 5.56 mm ammunition. The weapon class initSpeed value (820 m/s) takes precedence over the magazine initSpeed value (920 m/s), affecting its penetration formula as a result.
References[]
- ↑ Hlava, B et al. 2014, Arma 3: Field Manual - Weapons Info, Bohemia Interactive Community Wiki, viewed 6 March 2025, <https://community.bistudio.com/wiki/Arma_3:_Field_Manual_-_Weapons_Info>.
- ↑ FNH USA, LLC 2005, F2000 Tactical, FNH USA, viewed 23 August 2024, <https://web.archive.org/web/20051208043737/http://www.fnhusa.com/contents/tw_f2000tactical.htm>. (archived link)
- ↑ Monolith Arms 2008, FN FS2000, monolith-arms.com, viewed 23 August 2024, <https://web.archive.org/web/20080610042904/http://www.monolith-arms.com/servlet/the-FN--FS2000/Categories>. (archived link)
- ↑ van 't Land, J.J. 2013, SPOTREP #00006, Arma 3, viewed 28 January 2023, <https://dev.arma3.com/post/spotrep-00006>.
- ↑ van 't Land, J.J. 2015, SPOTREP #00045, Arma 3, viewed 10 August 2024, <https://dev.arma3.com/post/spotrep-00045>.
- ↑ van 't Land, J.J. 2016, SPOTREP #00052, Arma 3, viewed 10 August 2024, <https://dev.arma3.com/post/spotrep-00052>.
- ↑ 7.0 7.1 Kovařič, V 2017, SPOTREP #00067, Arma 3, viewed 10 August 2024, <https://dev.arma3.com/post/spotrep-00067>.
- ↑ 8.0 8.1 Purchese, R 2011, Arma 3 a PC exclusive for summer 2012, Eurogamer, viewed 25 February 2023, <https://www.eurogamer.net/arma-3-a-pc-exclusive-for-summer-2012>.
- ↑ van 't Land, J.J. 2013, SPOTREP #00008, Arma 3, viewed 11 September 2023, <https://dev.arma3.com/post/spotrep-00008>.
External links[]
See also[]
Variants[]
Weapons of comparable role and configuration[]
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Handguns | ACP-C2 .45 |
Carbines | TRG-20 5.56 mm |
Assault rifles | Mk20 5.56 mm • TRG-21 5.56 mm (TRG-21 EGLM) |
Designated marksmen rifles | Mk14 7.62 mm |
Squad automatic weapons | Mk200 6.5 mm |
Launchers | MAAWS Mk4 Mod 0 • RPG-42 |
Static | M2 • Mk6 Mortar • SPG-9* |
(Parenthesis) denote variants. * this weapon is not available in a standalone turret configuration and is only available as a vehicle-mounted weapon. Marksmen DLC | Apex DLC | Tanks DLC |
![]() | |
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Handguns | ACP-C2 .45 |
Carbines | AKS-74U 5.45 mm • Mk20C 5.56 mm • TRG-20 5.56 mm |
Assault rifles | AK-12 series (AK-12, AK-12 GL) • AKM 7.62 mm • Mk20 5.56 mm (Mk20 EGLM) • SPAR-16 series (SPAR-16, SPAR-16 GL) • TRG-21 5.56 mm (TRG-21 EGLM) |
Designated marksmen rifles | Mk14 7.62 mm • Mk18 ABR 7.62 mm |
Squad automatic weapons | LIM-85 5.56 mm • Mk200 6.5 mm |
Launchers | RPG-7 • RPG-42 |
Static | M2 • Mk6 Mortar |
(Parenthesis) denote variants. Marksmen DLC | Apex DLC |
![]() | |
---|---|
Handguns | ACP-C2 .45 |
Submachine guns | PDW2000 9 mm |
Carbines | Mk20C 5.56 mm |
Assault rifles | Mk20 5.56 mm (Mk20 EGLM) • SDAR 5.56 mm |
Designated marksman rifles | Mk18 ABR 7.62 mm |
Sniper rifles | GM6 Lynx 12.7 mm |
Squad automatic weapons | Mk200 6.5 mm |
Launchers | MAAWS Mk4 Mod 0 • PCML • RPG-42 • Titan MPRL • Titan MPRL Compact |
Static | M2 • Mk6 Mortar • Mk30 • Mk32 • Static Titan Launcher (AA, AT) |
(Parenthesis) denote variants. Apex DLC | Tanks DLC |