ARC-920 railgun

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ARC-920 railgun
Production overview


Acheron Security


Railgun carbine


63,405 cR[1]



43.6 inches (111 cm)[2]


12.5 inches (32 cm)[2]


2.9 inches (7.4 cm)[2]


14.9 kilograms (33 lb)[1]

Ammunition type:

16mm x 65mm M645 FTP-HE[3]

Feed system:

1 slug[4]


Electromagnetic linear accelerator

Rate of fire:


Effective range:

Close to medium

Service history

In service:

Reclamation conflict


The Asymmetric Recoilless Carbine-920, abbreviated ARC-920 or known simply as the railgun, is a compact-channel linear accelerator weapon used by the United Nations Space Command. It was designed and manufactured by Acheron Security.[5]

Design details[edit]

The ARC-920 uses a pair of parallel conducting rails to accelerate its projectiles. A large electric current flows from one rail into the projectile and then to the other rail; the electromagnetic effects of this interaction accelerate the projectile to an immense speed. The rifle requires a brief charging period before firing high-explosive rounds accelerated to an incredible speed.[6] The explosive yield contained in the round adds to the kinetic force of the impact, making the weapon effective against both infantry and armor.[5] The weapon lacks a scope.[6]


Compared to the Spartan Laser, the ARC-920's charging time is half the duration and deals less damage to vehicles. In addition, the travelling time for a fired shot is almost instantaneous.[6] In Campaign and Spartan Ops, the charging time is longer than in War Games.


Main-Legendary.png See our gameplay tips related to ARC-920 railgun on its gameplay tips page
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  • Canonically, a magnetically accelerated projectile would move at many times the speed of sound. However, for the sake of balance, the railgun's projectiles move at a much slower subsonic speed in gameplay.
  • Despite being a railgun, the rings that form around the barrel when charging, as well as the Railgun Kill medal depicting a projectile going through rings, seem more indicative of a coilgun.
  • This weapon's name may be a reference to the M-920 Cain, a railgun in the Mass Effect series. In addition, the number 920 is a reference to the number 7 (9-2-0=7)


List of appearances[edit]


  1. ^ a b Halo 4: Limited Edition, UNSC Infinity Briefing Packet
  2. ^ a b c Halo 4: The Essential Visual Guide, page 63
  3. ^ Halo 4 Interactive Guide
  4. ^ Halo Waypoint: The Halo Bulletin: 8.8.12
  5. ^ a b Game Informer: The Arsenal of Halo 4
  6. ^ a b c Halo Waypoint: The Halo Bulletin: 5.25.12