M90s were brought on the UNSC In Amber Clad, and thus were employed throughout the Battle of Installation 05.
Notably, the Master Gunnery Sergeant who oversaw John-117's issuing with his new MJOLNIR Mark VI armor was killed on Cairo Station while using an M90 to defend his armory from a pair of Sangheili. It went on to be widely utilized during the Battle of Earth. An M90 was also present during the ensuing Skirmish over Threshold. It played a notable part in the Battle of Installation 04, being used by UNSC Marines against the Covenant and Flood. It saw service in the hands of John-117 during Operation: SILENT STORM, but its most prominent usage came in 2552. The M90 was a common close-range battle implement in the service of the UNSC throughout the Human-Covenant War.
The Covenant learned to be wary of this weapon in urban environments, noting its close-range lethality. The M90's powerful cartridge makes it capable of efficiently engaging and defeating enemies with energy shielding within effective range. The spray of pellets from the weapon mean that at slightly longer ranges, it can be used to hit clusters of targets simultaneously, but also makes the weapon inefficient at extended ranges due to the low ratio of shot which hits the target to the amount of shot fired. The M90 is a devastating weapon in close, confined environments, with a loud report and strong recoil. It is possible at any time to top up the magazine with additional ammunition until it is full. Once the weapon’s magazine is expended, new rounds must be inserted one at a time into the receiver to continue firing. When the forend is fully retracted, the spent shell will have been ejected, and the way will have been cleared for the elevator component to position a new round for the bolt to carry into the chamber when the slide is once again pushed forward in the direction of the muzzle. Once the chambered round is fired, to repeat, the forend of the weapon is slid back across the weapon's underside in the direction of the stock, retracting the bolt and removing the spent shell from the firing chamber. The firing of the weapon produces a fiery muzzle flash as burning propellant gasses leave the barrel. If the weapon is loaded with standard ammunition, the weapon's firing will take the form of a spray of pellets, referred to as "buckshot", which are quite powerful at close range but lose damage efficiency as the spray disperses and loses energy. As is typical of human firearms, in order to discharge the weapon, the trigger positioned at the top of the pistol grip must be depressed. The M90 shotgun is hefted like a rifle, with the user's dominant hand holding the primary pistol grip, and their off-hand supporting the weapon by holding onto the forend (the portion of the weapon which is acted upon by the user to facilitate the pump action, which also acts as a forward grip for the off-hand). A flashlight is integrated into the weapon’s forend, which also features a prominent reddish button. The magazine possesses a dull grey or glossy black finish with ribbed indents along its length. The magazine of the weapon is prominently positioned above the barrel, with the weapon’s glowing iron sights mounted atop it and the receiver located just behind, facing upwards, roughly in-line with the trigger. It is generally utilized alongside MAG 15P-00B rounds, and is designed as a more practical and cost-effective recreation of Misriah Armory’s M45E Tactical Shotgun, though in UNSC service it is considered to be functionally identical. The extended magazine is included to aid the weapon's effectiveness in boarding actions. The M90 is a pump-action shotgun, chambered in the extremely powerful 8-gauge magnum shell, and feeding from a 12-round, dual-tubular, non-detachable magazine.
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