M90 Close Assault Weapon System
Production information
Manufacturer	Weapon System Technologies
Model	DTM Series-M90 CAWS
Type	Close Assault Weapons System
Cost	cR. 2200
Technical specifications
Size	Handheld, Two-Handed M90: Length: 118.3 centimeters M90A: Length (o/a):123.9 cm (48.8 in.) Length (barrel):61 cm (24 in.) Weight (empty):5.4 kg (11.9 lbs) Weight (loaded): 5.8 kg (12.8 lbs)
Damage Per Hit	Instant kill (Close range) Low-medium (medium ranges) None (long range)
Magazine Size	8 gauge magnum (3.5”) Earlier models: 12 Shells M90A: 6 Shells
Fire Mode	Pump Action
Ammunition Type	Soellkraft 8 Gauge Shell
Operation	Manual Pump-Action
Rate of Fire	1.5 shell/second
Muzzle Velocity	300-400 m/s (980-1300 f/s)
Accuracy	Low to Medium
Range	Short to Short-Medium Range 40 meters (131 ft)
Usage
Affiliation	United Nations Space Command

The M90 Close Assault Weapon System (abbreviated M90 CAWS), more commonly known as the M90 Shotgun, or informally as the Shotty, is the United Nations Space Command's primary shotgun and is one of the most lethal infantry weapons used by front line forces. 

 Introduction

The M90 Shotgun is the main UNSC close combat weapon, packing extreme firepower at close range. It can kill almost any enemy in one hit if every single pellet makes contact, and can usually kill up to three Covenant Grunts with only one blast at a similar distance. It is often wielded in urban conditions, where the tight spaces are conducive to the shotgun's wide spray. The shotgun also makes a perfect defensive weapon to fend off Covenant boarding parties inside warships, and is particularly effective against the Flood due to the tendency of Flood forms to close in and melee their targets.