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40px-Terminal.png This article, Type-51C Directed Energy Rifle/Improved, was written by Ajax 013. Please do not edit this fiction without the writer's permission.
Plasma Repeater Cropped
Type-51C Directed Energy Rifle/Improved
Production information

Iruiru Armory


Type-51C Directed Energy Rifle/Improved


Assault Rifle

Technical specifications

Length:97.4 cm Mass:6.5 kg

Magazine Size

battery, 200 shots, begins to overheats after 30 shots

Ammunition Type

superheated plasma

Rate of Fire

full automatic






M2A Light Assault Rifle (UNSC), MA6A ICWS (UNSC)




The Type-51C Directed Energy Rifle/Improved, or Plasma Repeater, is the Republic's current infantry carbine. Relatively new, in entered use with select Covenant units close to the end of the Great War. With advance fire control systems and never before seen cooling systems.


The Plasma Repeater is the middle ground between the Plasma Rifle and Storm Rifle, having greater rate of fire than the Storm Rifle but lower accuracy, and vice versa when compared to the Plasma Rifle. It shares most of the features of older plasma rifles, but also has a much more advanced cooling core, that requires no emergency venting, and will continue to function even once it's overheated, but at a reduced capacity. It can be vented manually, to restore full functionality. As the gun heats up, the thermal shroud slows down to keep up with the cooling capacity, but due to the reduced thermal distortion of the plasma emitters, it becomes more accurate, and sometimes it is purposely overheated, by circumventing the thermal shroud and near instantly overheating it, giving them slow, but accurate fire.

The weapon is fitted with an advanced fire control system, that tracks forward targets for precision aiming of the plasma bolts. Using similar tracking technology to the Needler, it manipulates the plasma bolts to fire within a thin cone in front of it, so it doesn't need the sights to be lined up exactly.

The C model augments many of the weapons features. Most notable are manufacturing changes to make it cheaper to build, and changes to the weapon to include a holographic sight, in line with other modern weapon variants.

The Plasma Repeater is used as a carbine rifle by regular forces, such as soldiers carrying large and unwieldy equipment, operate from cramped vehicles, operate stationary emplacements, or by special operations units, who can't afford the weight, require a shorter weapon for close range engagements and fight in short range fire fights.


The first prototypes for the Type-51 were created by Weaponsmiths from Iruiru Armoury, as a pet project to equip the Covenant with more lethal weaponry. Most of the Weaponsmiths had, at some point, served the Covenant as soldiers, and fought against humanity, encountering first hand the lethality of human weaponry. Human assault rifles were more accurate and more lethal at range than the Plasma Rifle, leaving the Covenant at a disadvantage. The designers sought to rectify this and emulate these designs, in the Covenant's own image. Taking technology from the plasma rifle, and combining it with technology from other weapons, and advanced Forerunner designs, they began crafting a new weapon.

Normally, such wanton free-design, and disregard for the sanctity of the Forerunner's designs, was tech-heresy of the highest order. However, the Hierarchs turned a blind eye to this for their own reasons. The weapon had proven itself extraordinarily deadly in testing, and two Prophets came to declare the design sanctified for their own reasons. Regret sought to have his faithful armed with the best for their conquest, and had them manufactured for his forces, personally. Truth wanted the weapon for his Jiralhanae faithful, in preparation for the Schism. However, both were sorely disappointed when demand far outstripped their manufacturing capabilities. The Repeater proved more expensive and difficult to manufacture than initially thought, slowing down production. Iruiru Armoury also fiercely guarded the design, refusing to allow the design to be disseminated to any other foundries, especially those on High Charity. This meant only a few hundred were shipped by the time of Reach, and most were in the hands of the forces there. When Truth demanded a greater tithe of weapons, more than Regret and his Sangheili faithful, Iruiru Armoury made a few creative changes to the shipping manifests, to waylay and redirect weapons that should have gone to Jiralhanae packs.

These weapons were deployed on Reach, reaching the hands of Sangheili special forces and officers, as well as some Brute forces, then saw widespread use against the Covenant when the Sangheili split from the Covenant. In the final days of the war, the weapon entered mass production and saw limited usage with infantry against Covenant Forces. After the war, it continued to be used in large numbers, by multiple sides in the Blooding Years. Eventually, it became carbine of choice for the Republic.

UNSC Remarks

Weapons of the USR

Energy Rifles

Plasma Rifle | Plasma Repeater | Storm Rifle | Concussion Rifle

Kinetic Rifles

Needler | Carbine | Needle Rifle | Needler Shotgun


Plasma Pistol | Nail Gun | Fuel Rod Burster

Heavy Weapons

Plasma Caster | Fuel Rod Gun | Plasma Launcher | Needler Cannon | Assault Cannon

Sniper Rifles

Beam Rifle | Focus Rifle | Fuel Rod Rifle

Support Weapons

Plasma Cannon | Plasma Mortar | Plasma Flamer


Plasma Grenade | Fusion Grenade | Electricity Grenade

Melee Weapons

Energy Sword | Energy Greatsword | Curveblade

Energy Garrote | Energy Dagger | Tactical Knife

Energy Pike | Energy Spear | Energy Glaive | Energy Halberd | Type-34 Energy Weapon/Lance


Anti Matter Charge | 'Bouncing Betty' | 'Jumping Jack'