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Halo Fanon
Terminal.png This article, M99CA1 Special Application Scoped Rifle, was written by Ajax 013 and Sgt.johnson. Please do not edit this fiction without the writers' permission.
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"I remember checking over a Brute hit by one of these. The only solid part left was his jawbone!"
―UNSC Staff Sergeant, Naval Special Warfare
M99CA1 Special Application Scoped Rifle
Production information

M99 Series


Gauss Rifle



Technical specifications

Handheld, Two-Handed

  • Dimensions:
    • length (o/a): 1750mm
    • Weight: (loaded) 18.5 kg
Damage Per Hit

Very High

Magazine Size

Five Rounds

Fire Mode


Ammunition Type

5.4 mm x 25mm


Gauss System

Rate of Fire

Muzzle velocity: 15,000 meters per second


100% at distances under 5 kilometers, 99.85% at 9 km


Long Max Effective Range: 15 Kilometers


Necros War




The M99CA1 Special Application Scoped Rifle (SASR), also commonly called the Stanchion after it's creator, Francine H. Stanchion, is an anti-material Sniper Rifle in use by the UNSC in the 2500s. The C variant was a major improvement to the original design, as well as the failed M99B variant.

Operating System

The M99C uses an asynchronous linear induction motor, enabling it to electromagnetically propel a munition at huge speeds. The true beauty of the weapon is in the fact that instead of working from a simple firing-pin - propellant mechanism, it works on a Gauss System, in which a magnetic round is fired using electromagnets. In this weapon, the power from the linear induction motor is sent to a series of coils, spread along the length of the barrel, turning the coils into electromagnets. The sequential firing of these coils accelerates the round to high speeds, and the round continues out the barrel due to inertia. However, due to the high-technology involved, the M99C would be very difficult to replace, much to the chagrin of UNSC leaders.

Due to this, the weapon is either linked to a generator (mainly when the sniper is in a fixed position), or rechargeable solid state battery packs fitted into the stock, which have lifespan of around 1.5 hours. However, due to an increase in technology, the generators are smaller and man-portable (able to fit into a backpack), and the batteries are also smaller than in the original version, decreasing the weight of the weapon by two pounds. The weapon, once fired, requires a four second recharge time, to recharge all the battery capacitors.

The weapon itself is made out of tough thermoplastics, designed to resist the heat produced by the weapon and provide a tough and rigid shell for the weapon. Tougher elements are made from titanium alloys, protecting itself from major impacts and bumps. The barrel is constructed from heat resistant carbonized metal, to stop thermal distortion, which could change the positions of the coils by millimetres, resulting in shots that could miss by metres, at extreme ranges. The barrel is covered in a doppler cooling jacket to protect the weapon from the excess heat it produces. This doppler jacket captures heat then cools it via the doppler effect, keeping the weapon near room temperature, reducing the likelihood of it overheating and reducing its thermal signature.


The M99CA1 uses a 5.4mm round, made out of ferro-magnetic or paramagnetic material. As a result, the Stanchion has access to a wide variety of rounds. as a result, it can fire ferric-tungsten rounds, depleted uranium or EXCALIBUR munitions. Its choice of munition include regular snub nosed slugs, causing excessive amounts of damage to individual targets, armour piercing rounds, splinter round, explosive and incendiary rounds.


The M99CA1 is rarely seen in the rounds of regular forces, though a few are seen in the hands of explosive ordnance disposal specialists. More often than not, they are used by UNSC Special Forces, as extremely long range anti-materiel/anti-personnel rifles. During conflicts, its a chosen method of taking out enemy leadership and vital materiel. As a result, many special forces detachments have at least one sniper team using this weapon system.

It is most commonly used when engaging forces at massive range, often across dense terrain where the power of the round, combined with reconnaissance assets means a shot can be designated regardless of line of sight, or in tight urban combat situations, where line of sight is not always a possibility, and targets must be neutralized, often through several walls, or even through an entire building.

UNSC Remarks

"The new generation ammo, the incendiary slugs, they blow people in half AND set fire to them. Awesomeness."
―UNSC Armorer[src]
"Oh snap, where's the other half of his body?"
―UNSC Sniper[src]

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