Editing M66 light railgun

{{Status|Canon}}
{{Center|''For the infantry weapon, see [[ARC-920 railgun]].''}}
{{Weapon infobox
|name=M66 light railgun
|image=[[File:HW-SP42CobraMBT.png|300px]]<br>A Cobra sporting twin M66 railguns.
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|type=[[Railgun|Light railgun]]
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|service=[[Insurrection]]<br>[[Human-Covenant War]]
|length=
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|ammotype=30mm shells
|capacity=
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The '''M66 light railgun''' ('''M66 LRG''') is an anti-vehicle [[Railgun (fiction)|railgun]] weapon system employed as a heavy munition in the [[Colonial Military Authority]] (CMA) and [[United Nations Space Command]] (UNSC).{{Ref/Book|Id=EVG|EVG|Page=32}}{{Ref/Book|Id=Enc11|Enc11|Page=239}}{{Ref/Book|Id=Enc22|Enc22|Page=142}}

==Overview==
===Design details===
The M66 LRG is a powerful anti-armor weapon that fires 30mm high-density ferrous projectiles at ultra-high velocity. The velocity of these projectiles allows them to penetrate armor at extreme range and with superior penetration to the [[M512 smooth-bore high-velocity cannon|M512 90mm SBHV cannon]] used by the [[M808 Scorpion]].{{Ref/Reuse|EVG}}{{Ref/Reuse|PrimaCobra}}{{Ref/Site|Id=HWCS|URL=http://www.halowars.com/GameInfo/vehicledepot.aspx#cobra|Site=Official Halo Wars Community Site|Page=Cobra|D=28|M=02|Y=2011|LocalArchive=Archive:Halowars.com/UNSC#Cobra}} The M66 has a power draw of 8 megajoules.{{Ref/Book|Id=PrimaTurret|Halo Wars: Official Strategy Guide|Page=30}}{{Ref/Book|Id=PrimaCobra|Halo Wars: Official Strategy Guide|Page=43}}{{Ref/Note|While page 43 of the ''[[Halo Wars: Official Strategy Guide]]'' describes the M66 has having a draw of 16MJ, it also describes the larger and more powerful M98 as having a power of 8MJ. On page 30 while describing the base turret weaponry, the M66 is identified as having a draw of 8MJ. The numbers shown on page 43 are presumably an error.}}

Though the weapon performs similarly to [[Gauss cannon]]s such as the [[M68 Gauss cannon|M68 model]], the M68 is a coilgun, which operates on different principles from those of a railgun.

===Usage===
The M66 railguns are most notable for their twin installment in the turret of the [[SP42 Cobra]], allowing the vehicle to serve as an agile tank-hunter and anti-fortification vehicle.{{Ref/Reuse|Enc22}} They are mounted on the Cobra alongside the larger and more powerful [[M98 light railgun|M98 105mm light railgun]].{{Ref/Reuse|EVG}}{{Ref/Reuse|Enc11}}{{Ref/Reuse|Enc22}} M66's may also be installed as an optional anti-vehicle mounting in the [[M5 Talos]] automated turret system installed on [[Firebase|prefabricated bases]].{{Ref/Reuse|PrimaTurret}}

When twin-mounted on the SP42 Cobra and on automated turrets, each weapon is fired alternatively, as the energy required to fire both railguns together is beyond what the platform is capable of producing. This alternating also improves the weapon's rather low rate of fire, maintaining more consistent power output.{{Ref/Reuse|HWCS}} 

==Gallery==
<gallery>
File:HW TurretUpgrades Concept.jpg|Concept art for a turret's railguns.
File:HW UNSCTurret Concept 1.jpg|Concept art for the railgun (right).
File:HW-Turret with Railgun.jpg|M66s mounted on a 2531-era defensive turret.
File:HW UNSCTurret.jpg|A medium-level turret with M66 railguns mounted.
File:HW2 BaseTurret AntiVehicle.png|M66s mounted on the 2559-era turret.
</gallery>

==List of appearances==
*''[[Halo Wars]]'' {{1st}}
*''[[Halo Wars 2]]''

==Notes==
{{Ref/Notes}}

==Sources==
{{Ref/Sources}}

{{UNSC heavy weapons}}
[[Category:Magnetic acceleration weapons]]
[[Category:Artillery]]
[[Category:UNSC ground weapons]]