View source for M21 (S.O.G.)

{{DISPLAYTITLE:XM21 (S.O.G.)}}
{{Infobox/Dummy}}
{{Disambig2|the XM21 sniper rifle featured in [[ArmA 3|ArmA 3's]] [[S.O.G. Prairie Fire|S.O.G. Prairie Fire Creator DLC]]|M21/M21 SWS in [[ArmA: Cold War Assault|ArmA: CWA]]/[[ARMA Reforger]]|M21|M21 in [[CSLA Iron Curtain]]|M21 (CSLA)}}
{{Quote|The US Army wanted an accurate sniper rifle during the Vietnam War. The M14 was selected because of its accuracy, reliability, and the ability for a quick second shot. In 1969 National Match-grade M14 rifles were converted by adding a 3-9x Adjustable Ranging Telescope (ART) sight and supplying Match-grade ammunition, and designating it the XM21 Sniper Weapon System.|Author = Field Manual}}
[[File:Arma3-render-sogpfxm21.png|center|300px|The XM21 7.62 mm sniper rifle.]]
{{Infobox/Weapon
|Name = XM21 7.62 mm
|Image = [[File:Arma3-icon-sogpfxm21.png|200px]]
|Faction = {{Blufor}} [[MACV-SOG (S.O.G.)|MACV-SOG]]<br />{{Blufor}} [[Australia (S.O.G.)|Australia]]<br />{{Blufor}} [[New Zealand (S.O.G.)|New Zealand]]<br />{{Blufor}} [[Republic of Korea (S.O.G.)|ROK]]<br />{{Greenfor}} [[Army of the Republic of Vietnam (S.O.G.)|ARVN]]
|Type = [[S.O.G. Prairie Fire Weapons#Sniper Rifles|Sniper Rifle]]
|Caliber = [[:Category:7.62 mm|7.62×51 mm]]
|Mag cap = 20<ref name="CfgMagazines20RndM14Magazinecount" group="CfgMa">''CfgMagazines >> vn_m14_mag >> count''</ref> / 10<ref name="CfgMagazines10RndM14Magazinecount" group="CfgMa">''CfgMagazines >> vn_m14_10_mag >> count''</ref>
|Mass = 100<ref name="CfgWeaponsXM21mass" group="CfgWp">''CfgWeapons >> vn_m21 >> WeaponSlotsInfo >> mass''</ref>
|Dispersion = 0.0007 rad<br /><ref name="CfgWeaponsXM21SAdispersion" group="CfgWp">''CfgWeapons >> vn_m21 >> Single >> dispersion''</ref><ref name="CfgWeaponsXM21FAdispersion" group="CfgWp">''CfgWeapons >> vn_m21 >> FullAuto >> dispersion''</ref>
|Recoil = <div class="mw-collapsible mw-collapsed">Standing:<ref name="CfgWeaponsXM21recoil" group="CfgWp">''CfgWeapons >> vn_m21 >> recoil''</ref><pre>vn_recoil_arifle_m14</pre><br />Prone:<ref name="CfgWeaponsXM21recoilProne" group="CfgWp">''CfgWeapons >> vn_m21 >> recoilProne''</ref><pre>vn_recoil_arifle_m14</pre></div>
|Inertia = 0.5<ref name="CfgWeaponsXM21inertia" group="CfgWp">''CfgWeapons >> vn_m21 >> inertia''</ref>
|Dexterity = 1.5<ref name="CfgWeaponsXM21dexterity" group="CfgWp">''CfgWeapons >> vn_m21 >> dexterity''</ref>
|Variants = [[M14 (S.O.G.)|M14]]
|Games = {{CDLC-A3-SOG}}
}}
The '''XM21''' is a 7.62 mm [[:Category:Sniper rifles (S.O.G.)|sniper rifle]] used by several BLUFOR and INDFOR factions in [[ArmA 3]]. It was added with the release of the [[S.O.G. Prairie Fire|S.O.G. Prairie Fire Creator DLC]].

== Overview ==
{{Stub}}
The XM21 is an [[M14 (S.O.G.)|M14]] rifle that has been reconfigured and classified as a sniper rifle.

It loads from the same 20-round box magazines shared with the baseline M14 rifle and can similarly load (optional) reduced capacity 10-round magazines. The XM21 shares an identical muzzle velocity of 850 m/s.<ref name="CfgWeaponsXM21initSpeed" group="CfgWp">''CfgWeapons >> vn_m21 >> initSpeed''</ref> Its fire rate depends on selected fire mode: ~ 750 rounds per minute on semi-automatic<ref name="CfgWeaponsXM21SAreloadTime" group="CfgWp">''CfgWeapons >> vn_m21 >> Single >> reloadTime''</ref><ref name="SANormalROFFormula" group="Formula">''60 / reloadTime = 60 / 0.08''</ref> and ~ 740 RPM on full auto.<ref name="CfgWeaponsXM21FAreloadTime" group="CfgWp">''CfgWeapons >> vn_m21 >> FullAuto >> reloadTime''</ref><ref name="FANormalROFFormula" group="Formula">''60 / reloadTime = 60 / 0.081''</ref>

By default, XM21s are '''''always''''' fitted with a [[Optic M14 3-9x (S.O.G.)|day sight that has a magnification of 3x-9x]], though it can be swapped with a [[Scope AN-PVS2 Starlight (S.O.G.)|first generation night vision scope]] or removed altogether to revert back to only aiming with the XM21's ironsights.<ref name="CfgWeaponsXM21CowsSlotcompatibleItems" group="CfgWp">''CfgWeapons >> vn_m21 >> WeaponSlotsInfo >> CowsSlot >> compatibleItems[] >> {"vn_o_9x_m14","vn_o_anpvs2_m14"}''</ref> XM21s can mount the M14's [[Suppressor (S.O.G.)|7.62 mm sound suppressor]].<ref name="CfgWeaponsXM21MuzzleSlotcompatibleItems" group="CfgWp">''CfgWeapons >> vn_m21 >> WeaponSlotsInfo >> MuzzleSlot >> compatibleItems[] >> {"vn_s_m14"}''</ref> It can also be fitted with a [[Bayonet (S.O.G.)|bayonet]]<ref name="CfgWeaponsXM21PointerSlotcompatibleItems" group="CfgWp">''CfgWeapons >> vn_m21 >> WeaponSlotsInfo >> PointerSlot >> compatibleItems[] >> {"vn_b_m14"}''</ref> and have a [[Camo wrap (S.O.G.)|camouflage wrap]] over the stock.<ref name="CfgWeaponsXM21UnderBarrelSlotcompatibleItems" group="CfgWp">''CfgWeapons >> vn_m21 >> WeaponSlotsInfo >> UnderBarrelSlot >> compatibleItems[] >> {"vn_b_camo_m14"}''</ref>

''However'', it should be noted that attaching a suppressor at the same time with a bayonet will disable use of the latter; the suppressor must be removed first if the user intends on employing the bayonet's melee attack.
{{clr}}
== Sights ==
[[File:Arma3-sogpfxm21-ironsight-overview.jpg|thumb|center|480x270px]]
If the XM21's [[Optic M14 3-9x (S.O.G.)|default scope]] is removed, its ironsights can be used to aim with instead. The XM21's ironsights allow for manual zeroing starting from a minimum of 100 metres up to a maximum of 600 metres (100, 200, 300, 400, 500, 600).<ref name="CfgWeaponsXM21discretedistance" group="CfgWp">''CfgWeapons >> vn_m21 >> discretedistance[] >> {100,200,300,400,500,600}''</ref> By default, the XM21's ironsights are set to utilise a zeroing of 100 metres.<ref name="CfgWeaponsXM21discreteDistanceInitIndex" group="CfgWp">''CfgWeapons >> vn_m21 >> discreteDistanceInitIndex >> "0"''</ref>

Note that if an optic that can be zeroed beyond 600 metres is attached, the XM21 will only allow it to be zeroed up to a maximum of 1,000 metres.<ref name="CfgWeaponsXM21maxZeroing" group="CfgWp">''CfgWeapons >> vn_m21 >> maxZeroing''</ref>

== Melee ==
Without a [[Bayonet (S.O.G.)|bayonet]] attached, the user will strike targets with a buttstroke instead. This applies to all XM21 configurations regardless of the mounted type of scope or whether it has one attached to begin with. Melee attacks can inflict a maximum of up to 7 points of damage to the target if the buttstroke lands successfully<ref name="CfgAmmoMeleehit" group="CfgAm">''CfgAmmo >> vn_melee_stun >> hit''</ref>, whereas bayonet stabs can inflict 10.5 points of damage instead.<ref name="CfgAmmoStabhit" group="CfgAm">''CfgAmmo >> vn_melee_stab >> hit''</ref>

It should be noted that melee attacks will drain {{#expr: (100 * 0.04) * 1.5}} points of stamina<ref name="XM21MeleeStaminaCostFormula" group="Formula">''(mass * 0.04) * dexterity = (100 * 0.04) * 1.5''</ref> whenever a buttstroke or bayonet stab is performed.<ref name="MeleeStaminaDrainScript" group="SCR">''\vn\functions_f_vietnam\functions\melee\fn_melee_drainstamina.sqf''</ref>

== Ammunition ==
'''NOTE:''' ''The XM21 is capable of loading the same magazines utilised by non-S.O.G. 7.62 mm-chambered weapons. To minimise clutter, they are deliberately excluded from this section.''
{| class="wikitable sortable" style="text-align: center;"
! Ammo parameter !! 7.62 mm (Ball/Tracer)
|-
| style="text-align:center;"| '''Base damage value''' || 12<ref name="CfgAmmohit" group="CfgAm">''CfgAmmo >> vn_762x51 >> hit''</ref>
|-
| style="text-align:center;"| '''Aerodynamic friction''' || -0.0012<ref name="CfgAmmoairFriction" group="CfgAm">''CfgAmmo >> vn_762x51 >> airFriction''</ref>
|-
| style="text-align:center;"| '''Muzzle velocity (m/s)''' || 853<br /><ref name="CfgMagazines20RndM14MagazineinitSpeed" group="CfgMa">''CfgMagazines >> vn_m14_mag >> initSpeed''</ref><ref name="WeaponMuzzleVelocityOverride" group="note">''Only applies to the magazine itself. Even though the magazine has an initSpeed of 853 m/s, the M14's weapon class has its own initSpeed value defined (850 m/s) which always takes precedence over the magazine's initSpeed.''</ref><br />Actual: 850<br /><ref name="CfgWeaponsXM21initSpeed" group="CfgWp"/><ref name="ActualMuzzleVelocity" group="note">''This is the XM21's actual muzzle velocity. The weapon class initSpeed value (850 m/s) takes precedence over the magazine initSpeed value (853 m/s).''</ref>
|-
| style="text-align:center;"| '''Expected velocity (m/s)''' || 700<br /><ref name="CfgAmmotypicalSpeed" group="CfgAm">''CfgAmmo >> vn_762x51 >> typicalSpeed''</ref><ref name="ExpectedVelocityMeaning" group="note">''Damage will be reduced if the projectile's velocity drops below this value.''</ref>
|-
| style="text-align:center;"| '''Penetration depth (mm)''' || {{#expr: 853 * 1.6 * 15 / 1000}}<br /><ref name="CfgAmmocaliber" group="CfgAm">''CfgAmmo >> vn_762x51 >> caliber''</ref><ref name="762mmBallRHAFormula" group="Formula">''Magazine's initSpeed * Ammo's caliber * 15 / 1000 = 853 * 1.6 * 15 / 1000''</ref><br />Actual: {{#expr: 850 * 1.6 * 15 / 1000}}<br /><ref name="762mmBallPlusM14MVRHAFormula" group="Formula">''Weapon's initSpeed * Ammo's caliber * 15 / 1000 = 850 * 1.6 * 15 / 1000''</ref><ref name="ActualPenetration" group="note">''This is the actual penetration depth of the XM21's 7.62 mm ammunition. The weapon class initSpeed value (850 m/s) takes precedence over the magazine initSpeed value (853 m/s), affecting its penetration formula as a result.''</ref>
|-
| style="text-align:center;"| '''Deflection angle (degrees)''' || 20°<ref name="CfgAmmodeflecting" group="CfgAm">''CfgAmmo >> vn_762x51 >> deflecting''</ref>
|-
|}
XM21s can be loaded with four types of magazines.<ref name="CfgWeaponsXM21magazineWell" group="CfgWp">''CfgWeapons >> vn_m21 >> magazineWell[] >> {"M14_762x51"}''</ref> They can be shared with conventional [[M14 (S.O.G.)|M14 battle rifles]] '''''but not''''' with [[L1A1 (S.O.G.)|L1A1s]] and the [[L2A1 LMG (S.O.G.)|L2A1 LMG]].

20-round magazines have a weight of 12<ref name="CfgMagazines20RndM14Magazinemass" group="CfgMa">''CfgMagazines >> vn_m14_mag >> mass''</ref> "mass" units whereas 10-round magazines are lighter and have a weight of 6<ref name="CfgMagazines10RndM14Magazinemass" group="CfgMa">''CfgMagazines >> vn_m14_10_mag >> mass''</ref> "mass" units instead:

=== 20Rnd. M14 Mag ===
[[File:Arma3-ammunition-sogpf20rndm14.png|thumb|right|96x96px]]
Standard 20-round box magazine loaded with a 19/1 split of 7.62 mm ball and tracer ammunition.<ref name="CfgMagazines20RndM14Magazineammo" group="CfgMa">''CfgMagazines >> vn_m14_mag >> ammo >> "vn_762x51"''</ref>

The last round of the magazine will always emit a visible red tracer.<ref name="CfgMagazines20RndM14MagazinelastRoundsTracer" group="CfgMa">''CfgMagazines >> vn_m14_mag >> lastRoundsTracer''</ref>
{{clr}}
=== 20Rnd. M14 Mag (Tracer) ===
[[File:Arma3-ammunition-sogpf20rndm14.png|thumb|right|96x96px]]
Alternate 20-round box magazine loaded exclusively with tracer ammunition.<ref name="CfgMagazines20RndM14MagazineTracerammo" group="CfgMa">''CfgMagazines >> vn_m14_t_mag >> ammo >> "vn_762x51"''</ref>

All twenty rounds of the magazine will emit visible red tracers when fired.<ref name="CfgMagazines20RndM14MagazineTracertracersEvery" group="CfgMa">''CfgMagazines >> vn_m14_t_mag >> tracersEvery''</ref><ref name="CfgMagazines20RndM14MagazineTracerlastRoundsTracer" group="CfgMa">''CfgMagazines >> vn_m14_t_mag >> lastRoundsTracer''</ref>
{{clr}}
=== 10Rnd. M14 Mag ===
[[File:Arma3-ammunition-sogpf10rndm14.png|thumb|right|96x96px]]
Reduced capacity 10-rounder magazine loaded with a 9/1 split of 7.62 mm ball and tracer ammunition.<ref name="CfgMagazines10RndM14Magazineammo" group="CfgMa">''CfgMagazines >> vn_m14_10_mag >> ammo >> "vn_762x51"''</ref>

The last round of the magazine will always emit a visible red tracer.<ref name="CfgMagazines10RndM14MagazinelastRoundsTracer" group="CfgMa">''CfgMagazines >> vn_m14_10_mag >> lastRoundsTracer''</ref>
{{clr}}
=== 10Rnd. M14 Mag (Tracer) ===
[[File:Arma3-ammunition-sogpf10rndm14.png|thumb|right|96x96px]]
Alternate 10-round box magazine loaded exclusively with tracer ammunition.<ref name="CfgMagazines10RndM14MagazineTracerammo" group="CfgMa">''CfgMagazines >> vn_m14_10_t_mag >> ammo >> "vn_762x51"''</ref>

All ten rounds of the magazine will emit visible red tracers when fired.<ref name="CfgMagazines10RndM14MagazineTracertracersEvery" group="CfgMa">''CfgMagazines >> vn_m14_10_t_mag >> tracersEvery''</ref><ref name="CfgMagazines10RndM14MagazineTracerlastRoundsTracer" group="CfgMa">''CfgMagazines >> vn_m14_10_t_mag >> lastRoundsTracer''</ref>
{{clr}}
== Magazine compatibility ==
{{MagazineChart-A3SOGPF-xm21}}

{{CDLC-vanillaaddons|'''''+ [[ArmA 3|Base game]] magazines'''''|
'''NOTE:''' ''The following table includes magazines from the base game that can also be loaded into the M14 whilst the [[S.O.G. Prairie Fire]] Creator DLC is activated.''
{{MagazineChart-A3SOGPF-xm21vanilla}}
It should be noted that magazines from other Creator DLCs that share access to the same pool of magazines (Classname: '''M14_762x51''') can also be loaded into the XM21. '''''However''''', those Creator DLCs must be loaded simultaneously alongside [[S.O.G. Prairie Fire]] in order for them to appear as selectable options in the Virtual Arsenal.
}}

== Trivia ==
* Prior to Update 1.1, the XM21's ironsights had a slightly different reticle.<ref name="SOGPFUpdate111">Graham, R et al. 2021, ''S.O.G. Prairie Fire - Changelog'', Bohemia Interactive Forums, viewed 7 July 2025, <https://forums.bohemia.net/forums/topic/234698-sog-prairie-fire-changelog/?do=findComment&comment=3447057>.</ref>

== Gallery ==
<gallery widths="185">
Arma3-sogpfxm21-02.jpg
Arma3-sogpfxm21-00.png
Arma3-sogpfxm21-01.jpg
</gallery>

== Config/script references ==
{{Scroll box|
=== '''CfgAmmo''' ===
<references group="CfgAm"/>

=== '''CfgMagazines''' ===
<references group="CfgMa"/>

=== '''CfgWeapons''' ===
<references group="CfgWp"/>

=== '''Scripts''' ===
<references group="SCR"/>

=== '''Formulae''' ===
<references group="Formula"/>
}}

== Notes ==
<references group="note"/>

== References ==
<references />

== External links ==
* {{WikipediaLink|M21_Sniper_Weapon_System|M21 Sniper Weapon System}}

== See also ==
==== '''Variants''' ====
* [[M14 (S.O.G.)|M14]]
==== '''Weapons of comparable role and configuration''' ====
* [[M40 (S.O.G.)|M40]] (''Alternate [[MACV-SOG (S.O.G.)|MACV-SOG]] counterpart'')
{{Weapons (S.O.G.)}}
{{USA-armory (S.O.G.)}}
{{AU-armory (S.O.G.)}}
{{NZ-armory (S.O.G.)}}
{{ROK-armory (S.O.G.)}}
{{ARVN-armory (S.O.G.)}}
[[Category:Sniper rifles (S.O.G.)]]
[[Category:Weapons (S.O.G.)]]
[[Category:BLUFOR]]
[[Category:INDFOR]]
[[Category:7.62 mm]]
[[Category:Sniper rifles]]
[[Category:MACV-SOG (S.O.G.)]]
[[Category:Australia (S.O.G.)]]
[[Category:New Zealand (S.O.G.)]]
[[Category:Republic of Korea (S.O.G.)]]
[[Category:ARVN (S.O.G.)]]
[[Category:Battle rifles]]
[[Category:S.O.G. Prairie Fire]]
[[Category:Weapons of the United States]]