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Terminal.png This article, M45F Close Assault Weapon System, was written by Ajax 013. Please do not edit this fiction without the writer's permission.
M45F Close Assault Weapon System
Production information

Weapon System Technologies


DTM Series-M45F Close Assault Weapon System




cR. 2200

Technical specifications

Handheld, Two-Handed

  • Length: 124 cm
  • Length (barrel):61.5 cm
  • Weight (empty):5.4 kg
  • Weight (loaded): 5.6 kg
Magazine Size

8 gauge magnum (3.75”)

  • 12 shells
Fire Mode


  • Muzzle velocity:300-400 m/s
Ammunition Type

8 Gauge Shell


Gas Piston/Pump-Action

Rate of Fire

Muzzle velocity: 300-410 m/s


34-60 metres/110 metres


112 metres/210 metres


United Nations Space Command


The M45F Close Assault Weapon System (abbreviated M45F CAWS), more commonly known as the M90 Shotgun, is the United Nations Space Command's resident shotgun during the Necros War.


The M45F Shotgun packs extreme stopping power at close ranges, and will kill almost any enemy in at close ranges. It is often wielded in urban conditions, where the close ranges are conducive to the shotgun's mode of operation. The shotgun also makes a perfect defensive weapon to fend off enemy boarding parties inside starships. The weapon's power lies in the great stopping power of a cloud of ball bearings, or flechettes, which, while extremely powerful in close-quarter combat, are ineffective at long ranges. However, it should be noted that the shotgun user can engage enemies at medium ranges as well, with reduced effectiveness, especially with specialised ammunition.


The M90 is fed by a complicated 'over and under' tube magazine, utilising an eight round tube, fitted with a double redundant gas system, making it highly reliable. This allows the shooter to very specifically organise his ammunition, by deciding the order it is loaded in. The shells are loaded through the top feed hatch and are ejected through it when fired, the bolt of the M90 travels down into the receiver, taking recoil away from the shooter. The shotgun can fire regular buckshot rounds, flechette rounds, explosive, slug or breaching. The shotgun can switch effortlessly between semi-automatic and pump-action by toggling a switch on the gun. In practice, there are minor differences in rate of fire, but pump-action tends to be more efficient for loading, since the magazine can be cut off and reloaded mid-battle in pump-action mode, as well as being capable of loading specialised rounds mid-reload. It is also useful for the use of low velocity rounds.

New Features

The newest model, the M45F, is used in the Necros War. It is fitted with a number of Misriah Rails, one onto the receiver and two on either side of the forward grip. This allows the user of the shotgun to customize it with a wide variety of weapon add-ons to increase its efficiency in combat. It has fully adjustable and removable day/night iron sights.It can be augmented with a Rail Interface System that fits over the foregrip. The shotgun's gas system is doubled up, allowing it high reliability and redundancy, allowing it to function through a variety of hostile conditions.

The shotgun can be fitted with a regular stock, which an in turn carry a number of shells internally. This can be swapped for commercially available collapsing stocks or removed entirely to reduce the over all length.


The M45F is primarily used by UNSC forces for house to house and urban fighting. Its unmatched lethality at close quarters guarantee a kill, even against shielded and armoured opponents. Ideal for breaching then clearing a building, the M45F can also be used as an anti-materiel weapon or as a non-lethal weapon, firing electroshock munitions, bean-bag rounds or rubberised munitions. Its also used in boarding operations, where its low-penetration with fail to breach the hull of the ship. It also sees substantial use in the hands of special forces, who use the multitude of specialised rounds to attack the enemy.


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