Editing M990 electrothermal-chemical smoothbore cannon
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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}} | 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}} | ||
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. | 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.}} | ||
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= | 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=ONI 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.}} | ||
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. | 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. | ||
==List of appearances== | ==List of appearances== | ||
