Halo Fanon
Halo Fanon
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Terminal.png This article, M12 Special Operations Carbine, was written by Ajax 013. Please do not edit this fiction without the writer's permission.
"Did some tech just dump a Bee-are on top of a SMG and then drove a steam roller over it?"
―Captaion Kieran Keller

M12 SOC 2.png
Production information

Sub Machine Gun/Carbine

Technical specifications
  • Barrel
    • 440 mm
  • Weight
    • 2.7 kilograms (unloaded), 3.4 kilograms (loaded)
  • Length
    • 600 mm
Magazine Size

64 rounds

Fire Mode
  • Semi-Automatic
  • Automatic
  • Burst
Ammunition Type




Rate of Fire

900 rounds per minute


340 metres


510 metres


Necros War




The M12 Special Operations Carbine is a small bullpup weapon, utilising the miniaturized 5.7x31mm rifle round. The M12 SOC is used specifically by UNSC special forces and was designed to fit a variety of roles within different SOCOM branches.


The M12 SOC is utilised by a variety of SOCOM units, as a carbine, submachine gun and personal defence weapon. The rifle is highly accurate to ranges of 300 metres and is incredibly deadly at short range. The weapon has a high rate of fire, high magazine capacity and excellent stability. The 5.7mm mini-rifle rounds cause surprising amount of damage to armoured and shielded infantry, with the high magazine capacity allowing a user to down a Brute infantryman with easy. However, against armoured targets, the round begins to lose effectiveness at 200 metres. The weapon often sees use in the hands of SOCOM operators, requiring a short but powerful weapon with a high magazine capacity. It is often seen in the hands of reconnaissance specialists, point men, airborne or drop-pod deployed operators or as the secondary weapons of spotters or weapon specialists.


The M12 SOC is blowback operated weapon which fires from closed bolt. The firing is controlled by a removable trigger unit with conventional hammer. A manual safety is located directly above the trigger. Magazine lies in the butt of the weapon, feeding from front-to-back. Spent cartridges are ejected through the ejection on the right side of the fire arm. When fired, the bolt travels down the receiver rather than backwards to absorb recoil and direct it away from the shooter. The weapon comes with three Misriah Rails, one above the receiver, and two on each side of the barrel. The ammo is held in a helical magazine, allowing maximum amount of ammunition for minimum amount of space. The weapon features a forward cocking handle on the left side and ambidextrous thumb operated magazine release allowing for speed reloading. The weapon can be modified for left handed users.


In addition to the stock model the M12 also featured two variants, the M12 Heavy Model, and the M12 Suppressed.

The M12H SOC

  • M12 Heavy Model: Intended to provide users of the M12 with even more fire power at short ranges, the M12 heavy model utilises the more powerful 12.7mmx30mm handgun round in a deep 65 round magazine. But these features came at the price of heavier weight, and higher recoil. The weapon is still more compact than an assault rifle, and the increase in accuracy and stopping power over the stock M12 is marked. The M12H can trace its heritage to the Anti-Personnel Carbine from from the mid fifties, a weapon appropriated by special forces units to combat flood forms, the high capacity and high calibre causing extensive damage.

The M12S SOC


  • M12 Suppressed: Fitted with an integral sound and thermal suppressor, this variant of the M12 allowed users to lay down almost silent fire, while using standard ammunition. The large integral suppressor can be adjusted, allowing varying levels of gas to be bled from the barrel, allowing the user, in effect, to toggle between rounds reaching standard velocities and the rounds reducing to subsonic. This allows the M12 to avoid the length of a fitted suppressor and the need for specialized subsonic ammo. The H version also has a suppressed variant.

UNSC Comments

"Kicks a lot harder than the Em Seven but it deals a shit lot more damage."

"These four guys come up to the factory CP over at Hellevecta, all in black suits and armed to the teeth with these things, complete with mods. Looked damn badass."

"Four years fighting in the Special Recon Regiment, all that time I've used the same mod. Night Vision Laser pointer, a UV Flashlight, not that I've ever used it and a SUROG."


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