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| {{Status|Canon}} | | {{Era|Post}} |
| {{Weapon infobox | | {{Weapon infobox |
| |name=M990 electrothermal-chemical smoothbore cannon | | |name=M990 electrothermal-chemical smoothbore cannon |
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| |manufacturer=[[Chalybs Defense Solutions]] | | |manufacturer=[[Chalybs Defense Solutions]] |
| |series= | | |series= |
| |type=Smoothbore tank gun{{Ref/Reuse|Universe}} | | |type=Vehicle-mounted cannon |
| |cost= | | |cost= |
| |variant= | | |variant= |
| |service=[[Post-Covenant War conflicts]] | | |service=[[Post-Covenant War conflicts]] |
| *[[2557]]-present{{Ref/Reuse|Universe}}
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| |length= | | |length= |
| |width= | | |width=150mm |
| |height= | | |height= |
| |weight= | | |weight= |
| |ammotype=150mm shells {{C|various}}{{Ref/Reuse|Universe}}{{Ref/Reuse|Enc22}} | | |ammotype=Various |
| |capacity=
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| |feed= | | |feed= |
| |operation=[[Wikipedia:Electrothermal-chemical technology|Electrothermal-chemical]] | | |operation= |
| |rate= | | |rate= |
| |velocity= | | |velocity= |
| |optics=
| | |range=Long |
| |range= | |
| }} | | }} |
| The '''M990 electrothermal-chemical smoothbore cannon''' is a vehicle-mounted heavy weapon in the service the primary armament of the [[M820 Scorpion]], introduced into widespread service in [[2557]].{{Ref/Site|Id=Universe|URL=https://www.halowaypoint.com/en-us/universe/vehicles/scorpion|Site=Halo Waypoint|Page=Scorpion|D=21|M=04|Y=2021}}{{Ref/Book|Id=Enc22|Enc22|Page=140}} | | The '''M990 electrothermal-chemical smoothbore cannon''' is the primary armament of the [[M820 Scorpion]], introduced into widespread service in [[2557]].<ref>[https://www.halowaypoint.com/en-us/universe/vehicles/scorpion '''Halo Waypoint''': ''Scorpion'']</ref> |
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| ==Overview== | | ==Overview== |
| ===Design details===
| | Unlike the [[M512 smooth-bore high-velocity cannon|M512 cannon]] mounted on the M808, or even the [[M310 smooth-bore high-velocity cannon|M310 cannons]] mounted on the [[M850 Grizzly]], the M990 fires a much larger 150mm shell, and is capable of firing guided munitions and projected future advances in energetic propellants. ONI-operated Scorpions use an experimental shell, and [[Hannibal Weapon Systems]] has produced a prototype that uses a [[directed-energy weapon]] mounted within the barrel. |
| Unlike the [[M512 smooth-bore high-velocity cannon|M512 cannon]] mounted on the M808, or even the [[M310 smooth-bore high-velocity cannon|M310 cannons]] mounted on the [[M850 Grizzly]], the M990 is an [[Wikipedia:Electrothermal-chemical technology|electrothermal-chemical gun]], and is considered the single-biggest improvement on the M820 platform over its M808 predecessors.{{Ref/Reuse|Enc22}} | |
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| According with its new operating principle, the M990 breaks legacy munitions compatibility with its predecessor models and fires a much larger 150mm shell, and is capable of firing guided munitions and projected future advances in energetic propellants.{{Ref/Reuse|Universe}} Some of the projected propellant advances are already in service among the fleet of [[ONI Scorpion|select Scorpion variants]] operated by the [[Office of Naval Intelligence]]'s [[ONI Security|security forces]], which use an experimental shell and the latest energetic propellants.{{Ref/Game|H5G|List of REQ cards|REQ Card|Detail=ONI Scorpion Description|Quote=ONI spares no expense with its "security" Scorpions, outfitting them with experimental ammunition using the latest energetic propellants. Advanced Scorpion with heavy armor and upgraded cannon.}}{{Ref/Site|URL=https://www.halowaypoint.com/en-us/news/canon-fodder-a-time-to-give-tanks|Site=Halo Waypoint|Page=Canon Fodder - A Time to Give Tanks|D=14|M=07|Y=2021}}
| | The M990 is extremely effective at penetrating heavy armor, including [[Type-58 Wraith]] tanks, and even Forerunner weapons such as the [[Z-510 focus turret]]. It is less effective against nimble aerial targets, such as the [[Type-54 Banshee]] or the [[Z-1800 Phaeton]], but is still easily capable of penetrating their armor. |
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| The [[XM820B4 Scorpion]], an experimental model produced by [[Hannibal Weapon Systems]], uses the M990 ETC gun's hull and structure as a base for the integration of a fast-discharge [[laser]] weapon system. Aesthetically, this weapon has few outward differences than the standard M990, though is functionally a [[directed energy weapon]] rather than a conventional tank gun.{{Ref/Game|H5G|List of REQ cards|REQ Card|Detail=Hannibal Scorpion Description|Quote=This is but one of Hannibal Weapon Systems' tank test beds fitted with the latest in vehicle-borne directed energy weapons. Advanced Scorpion with heavy armor and fast-discharge laser currently undergoing trials within UNSC Infinity War Games.}}{{Ref/Site|Id=CFClose|URL=https://www.halowaypoint.com/en-us/news/canon-fodder-close-quarters|Site=Halo Waypoint|Page=Canon Fodder - Close Quarters|D=17|M=10|Y=2021}}
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| The M990 is extremely effective at penetrating heavy armor, including {{Pattern|Kemu|Wraith}} tanks, and even Forerunner weapons such as the [[Z-510 focus turret]]. It is less effective against nimble aerial targets, such as the {{Pattern|D'nomlhe|Banshee}} or the [[Phaeton]], but is still easily capable of penetrating their armor. | |
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| ==Gallery==
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| <gallery>
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| File:H5G M820Scorpion Turret Concept.jpg|Concept art of the Scorpion's turret.
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| </gallery>
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| ==List of appearances== | | ==List of appearances== |
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| ==Sources== | | ==Sources== |
| {{Ref/Sources}} | | {{Ref/Sources}} |
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| {{UNSC heavy weapons}} | | {{UNSC heavy weapons}} |
| [[Category:UNSC ground weapons]] | | [[Category:UNSC ground weapons]] |
| [[Category:Projectile weapons]] | | [[Category:Projectile weapons]] |
