M90 CAWS

The M90 Close Assault Weapon System (M90 CAWS) is the UNSC's primary combat shotgun and is one of the most effective close range infantry weapons used by front line forces.

Design details
The M90 CAWS is a pump-action, magazine-fed weapon. It features a top-loading, side ejecting receiver and a tubular magazine under the barrel. The gun has dual action bars, an internal hammer, and a bolt which locks into an extension in the barrel.

Ammunition
The M90 Shotgun fires 12-gauge 3.5 inch magnum shells from an 8-round integral tube magazine. Recoil is relatively low. It can utilize incendiary rounds, solid slugs, flechettes, and a variety of other forms of ammunition, though these specialized ammunition types are only available through Mission Conditional Requisition (MCR).