Halo Fanon
Halo Fanon
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Terminal.png This article, M57 Pistol, was written by Ajax 013. Please do not edit this fiction without the writer's permission.
"Maybe its not the power house that the M6 is, but its so much more in every other aspect."
―UNSC officer

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Production information

Orochi Arms

Technical specifications
  • Barrel
    • 130 mm
  • Weight
    • 620 grams (unloaded), 740 grams (loaded)
  • Length
    • 225 mm
Magazine Size

18/30/42 round magazines

Fire Mode
  • Semi-Automatic
Ammunition Type





75 metres


105 metres




The M57 is a smaller, semi automatic UNSC pistol, designed to be complementary to the M6. While lighter and with a larger magazine capacity, it lacks the hard hitting power of the M6. Lightweight, and easy to use, its a favourite of UNSC personnel, and is often seen as a sidearm of personnel.


The M57 has seen large used with soldiers than can neither afford the M6's weight or low magazine capacity, especially those fighting lightly armoured enemies or fighting in extended warzones. The M57, as standard, is issued to marine and army riflemen, whereas the larger M6L is issued to marksmen and automatic riflemen, though practices differ based on individual TOE and mission requirements. The M57 may be used in areas where the enemy is expected to be well armoured, whereas the M6L will be used in areas where over penetration can be dire.


The M57 is a delayed blowback operated, semi-automatic firearm. It featured polymer frame with under barrel and over barrel accessory rail. The M57 features a Single Action trigger with short and light trigger pull and ambidextrous safety switch, located on the frame above the trigger. It is striker fired, with internal firing pin safety. The sights are fixed, night sights though it can be upgraded with different sights. The standard model has fully adjustable and removable day/night iron sights. The gun can be augmented with 'slide on' rail interfaces. The pistol's barrel is made from carbonized, heat resistant metal. The barrel extends forward from the gun and features threading capacity for the attachment of suppressors.


Due to the utilitarian nature of the M57 and the support of civilian markets and manufacturers, a number of commercial variants have been adopted for military use. Due to the universal nature of the weapon, there is a large market for additional components, giving it a wide range of available modifications.

M57 Compact

The M57 Compact is a smaller variant, with shorter barrel and smaller grip, and is issued with smaller sized magazines. This is often used as a 'pocket pistol' variant. The M57 Compact sees some use within ONI and SOCOM as a low profile, easily hidden pistol for undercover and plain clothes operations. The Compact has reduced accuracy and muzzle velocity, but can still neutralize a target at short range. The pistol has a extended threaded barrel to accommodate a suppressor.

M57 Auto

The M57 Auto is a variant outfitted with a select fire capability, allowing it to switch between semi-automatic, three round burst and fully automatic. The pistol can achieve surprisingly high rates of fire, coming near to 1100 rounds a minute. The pistol is utilised by units in special forces command, as a close quarters defence, capable of knocking down several well armoured targets in one go. The pistol is outfitted with a fire selector, a lengthened barrel with compensator cuts facing upwards for increased stability and refined components to sustain repeat fire.


The M57 Special Operations Command pistol is upgraded with match components to increase reliability, such as a high tolerance threaded barrel, bolt, enhanced trigger and adjustable sights to raise up over suppressors. These standardized variants are built for special forces personnel in tier 2 and 1 operations. They have increased accuracy and stopping power, as well as reduced recoil, increased firing control and reduced maintenance.


M57 Chimeras refer a number of private models, or models used by special forces operators. Chimeras are heavily modified with off the shelf components made for military and civilian versions of the M57. Such modifications include new sights, slides, frame, grips, trigger, trigger guard, stocks, muzzle compensators, lengthened barrels, installation of match grade components, etc. The result is unique pistols, unique to the operator. These often start lives as M57 SOC pistols.

UNSC Comments

"Sure, its not the handcannon the M6 is but it'll still pierce a Necros' face plate."

"The pistol is small, light, with minimal recoil and maximum killing power. Why do we not have more of these?"

"Its a little beauty. Well made, easy to service, light and powerful."

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