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Halo Fanon
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Terminal.png This article, M108A1 Close Assault Weapon System, was written by Ajax 013. Please do not edit this fiction without the writer's permission.
"I stepped down from the barricade into the exposed sewer tunnel. There had to be about twenty of them in their, completely off guard, just all looking at me, realising they'd forgotten to pick up their rifles. Ten seconds later, I was knee deep in Necros bits."
―Anonymous UNSC Soldier

Production information

Close Assault Weapon System

Technical specifications
  • Barrel
    • 425 mm
  • Weight
    • 3.8 kilograms
  • Length
    • 1100 mm (800 with the butt collapsed)
Magazine Size
  • 16 shell drum
  • 7 round magazine
  • 3 round magazine
Fire Mode
  • Semi-Automatic
  • Automatic
Ammunition Type

8 gauge Flechette shells


gas operated

Rate of Fire

300 shells a minute




80/200 metres


Necros War




The M108A1 CAWS is a gas operated and lightweight shotgun. The weapon is made from titanium alloys and an advance thermoplastic to handle heat distribution. The weapon is capable of automatic or semi-automatic fire.


The CAWS with optional RIS

The M108A1 is currently being rolled out for use by special operations units in the UNSC, providing a high rate of fire and high ammunition capacity. Being capable of automatic fire without the use of a pump action, the weapon immediately has a higher rate of fire and an ammo capacity double that of the M90. This easily outweighs its cons, such as loss of control under high rates of fire, decrease in accuracy and lack of adaptability. It found immediate use in assault teams, with combat engineers, as a close support weapon for weapons and tank crews, thanks to its collapsing stock, allowing storage in a smaller space and a essential weapon for urban and close quarters warfare. It features a Misriah Rail on the receiver and two on each side of the barrel and one under it.


The system employs a traditional gas chamber and piston, located below the barrel, and locking system that used single vertically sliding locking lug in the bolt head. Upon closure of the bolt, this lug is forced up to lock into the projection of the barrel. Upon discharge, gas piston forced the bolt carrier back, which, in turn, first lowered the locking lug to unlock the bolt, then carried the bolt back for reloading cycle. It carries a selective fire switch under the trigger, with safe, automatic and semi-automatic, with a second trigger safety. The magazine features a release catch, in front of the trigger, required to release the magazine. When fired, the bolt travels down into the receiver, taking recoil away from the shooter. It has fully adjustable and removable day/night iron sights.

The gun is fed by 3 round or 7 round magazines, or fed by a 16 magazine keeps the ammunition in a helical shape with a forced spring for loading. The drum magazine has an additional where it can be converted into a landmine, triggering the stored shells. The magazine is ejected by pressing down a lever on the magazine well, facing the trigger. Smart use of this lever allows experienced operators to quick load magazines by using the next magazine to operate the lever, ejecting the first.

UNSC Comments

The M108C, a variant designed for police use. Note the foregrip and shortened barrel.

"The weapon is the perfect antithesis to the M90. Its automatic where is semi-automatic, its got ammo capacity where the M90 has stopping power. Its like Ying and Yang..."

"I like the C version. Its been shortened and has a foregrip on, nice for the police but I wouldn't take it up against the Necros."

"We got a tactic called the 'street sweeper.' Basically we put it to auto or burst, lay it on its left side in our hands and aim at the right. The shotgun goes off, we hold down the trigger, it goes across the room, clearing it pretty effectively."

"I swear to God, I saw a Sierra Four using one of these like a foxtrotting sub machine gun! He held it perfectly steady as he blew off the whole entire magazine!"

Individual and Crew Served Weaponry of the UNSCDF


M6L Personal Defence Weapon System | M57 Pistol | M98 Compact | M19 Modular Pistol

Submachine Guns

M20A Submachine Gun | M12 Special Operations Carbine | M8Z Submachine Gun

Assault Rifles, Carbines, and Battle Rifles

MA6A Individual Combat Weapon System | M2A Carbine | M81 Special Purpose Carbine | M55C Enhanced Battle Rifle

Designated Marksman Rifles

M396 Designated Marksman Rifle | M97 Special Purpose Rifle | M113 Special Purpose Rifle

Machine Guns

M397 Individual Automatic Rifle | M739C Squad Automatic Weapon | M122 Light Machine Gun | M247B2 General Purpose Machine Gun | M247H2 Heavy Machine Gun | AIE-486K1 Heavy Machine Gun | M343A3 Heavy Machine Gun | M780 Special Purpose Machine Gun

Sniper Rifles

M22 Scout Rifle System | M818D Enhanced Modular Sniper Rifle System | M1091 Sniper Rifle System | Sniper Rifle System 99G-S6 Anti-Materiel | M99CA1 Special Application Scoped Rifle | M133 Precision Anti-Materiel Energy Weapon System


M45F Close Assault Weapon System | M108A1 Close Assault Weapon System | M77 Extreme Close Quarters Combat System

Energy Weapons

Weapon/Anti-Vehicle Model 6B Grindell/Galilean Nonlinear Rifle | MX4 Light Support Weapon | M921 ARC

Non-Lethal Weapon

M2 Threat-Negation Device | MX9 Pulsed Energy Projectile System | M39 Long Range Tranquillizer Rifle

Missile and Rocket Launchers

M41B2 Medium Anti-Vehicle/Assault Weapon | M899 Light Anti Armour Weapon | M57 Light Multipurpose Assault Weapon | M1 Multiple Launch Rocket System | M25 Underslung Rocket Launcher

Grenade Launchers

M319N Individual Grenade Launcher | M23 Multiple Grenade Launcher | M363B RPD | M460C Automatic Grenade Launcher | M556 Counter Defilade Grenade Launcher | M24 Underslung Grenade Launcher | M26 Grenade Launcher Module


M71 Mortar | M78 Mortar | M81 Mortar


M117 Light-Weight Field Howitzer

Sentry Guns

M55 GUARD DOG Sentry Gun | M601 GARGOYLE Sentry Gun


M9 Dual Purpose/High Explosive Grenade | M2 Anti-Materiel Grenade | M70 Flash Bang Grenade | M43 Smoke Grenade

Anti-Personnel and Anti-Armour Mines

M320 Anti-Tank Mine | M341 Anti-Tank Mine | M362 Anti-Tank Mine | M121 Bounding Anti-Personnel Mine | M127 Anti-Personnel Mine

Explosive Devices

C-7 Foaming Explosive | C-13 Gertex | C-14 Plastic Explosive | C-15 Liquid Explosive | M303 Thermite Cord | M311 Detonation Cord | M382 Special Munition Attack Charge (Kinetic) | M390 Breaching Charge | M394 Clearance Charge | M404 Special Lightweight Attack Munition | M366 Demolition Charge | M376 Satchel Charge | M379 Explosive Pack