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Terminal.png This article, MX4 Light Support Weapon, was written by Ajax 013. Please do not edit this fiction without the writer's permission.
"Nothing beats streams of plasma."
―Major Phil Hartigan

Production information

Light Support Weapon

Technical specifications
  • Barrel
    • 620 mm
  • Weight
    • 5.7 kilograms.
  • Length
    • 970 mm
Magazine Size

120 charges

Fire Mode
  • Automatic
  • Burst
Ammunition Type

Cadmium Telluride pellets


magnetic acceleration of super heated gas

Rate of Fire

1000 rounds per minute


560 metres


1200 metres


Necros War




The MX4 LSW is the second UNSC directed energy weapon issued to their personnel. The MX4 is used by regular and special forces in the light machine gun role, allowing a platoon to engage shielded infantry with ease.


The Weapon was first issued to frontline troops fighting Brutes in the Remnant forces. The weapon was well liked because of the punishment it could bring down on their shielding. It is increasingly issued in a position similar to the M122 LMG. Since it was accurate and had a hefty rate of fire it was used primarily in supporting roles. It is issued to at least one automatic rifleman in a platoon. The weapon is used to lay down swathes of suppressing fire.


The MX4 is made from lightweight polymers, with ceramic barrel components to resist the heat. The gun is built around a computerised firing assembly, long barrel and a folding stock, allowing it to be compacted for manoeuvrability. The weapon features a Misriah Rail along the receiver, underneath the barrel and on either side of the barrel. The magazine fits inside the rifle just in front of the trigger, with a magazine release catch just above the magazine well. The trigger grouping is above the trigger, with a safe setting, semi-automatic/over-charged setting and fully automatic. The cocking handle to load the first pellet is located above the magazine well.

The MX4 uses Camium Telluride pellets in a 120 round magazine, which is fed into a ionization chamber where a impulse laser ignites the pellets and vaporizes them into super heated gas. The weapon's barrel is laced with magnetic coils which creates a magnetic 'tunnel'. The plasma is volleyed down the tunnel and spat out a 800 m/s. Each magazine carries both the pellets and the battery pack necessary to power the weapon, making ammunition requirements totally self sustained within the magazine.

The weapon can fire continuously for between fifty-sixty shots before it overheats. The laser cuts off, the magazine is sealed off and the cooling fins open up, allowing the magnetic tunnel to ventilate and cool down. The barrel is chilled by a electronically controlled temperature control system, utilising a number of heat absorbent sinks, utilising Doppler Cooling to capture heat produced from it and cool them via the doppler shift. The magazine is sealed off to prevent it potentially catching fire and exploding.

The weapon can also be over charged, by dumping twenty pellets into the ionisation chamber and withholding the magnetic field, causing the plasma to form into one large munition, which has sufficient power to penetrate the armour of light vehicles, though not necessarily destroy them and generate a short term, low range electro-magnetic effect. This allows the LSW to effect light armour. This charged mode has a similar explosive yield to a 40mm grenade, allowing it to effect light armour and exposed infantry.

UNSC Comments

"When we knew we were going up against Jackals with shield gauntlets, we sent our plasma jockey on point, with our rifleman on overwatch. We flushed them out and fucked them up!"

"That Prowler was barrelling around like a bat out of hell, spitting plasma. Lewy charged up his plasma rifle and shot off a round. Penetrated the armoured between the plates, hit the turbine engine. The entire thing exploded, the gun shut down, it flipped twice and rolled off the cliff. Fucking epic!"

"Who the fuck needs tracers, with this thing during a night fight? We were half a click outside the spaceport, we could barely see them. Then Jackie boy opens up with that plasma rifle, and the entire place lights up with red death."

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

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