M555 Gauss cannon
This article is about the model introduced in Halo 5: Guardians. For the model introduced in Halo 2, see M68 Gauss cannon.
The M555 Electromagnetic Launcher (M555 EL), known simply as the Gauss cannon is a portable turret in use by the UNSC Armed Forces, specialized ONI units, and private corporations such as Liang-Dortmund after the Human-Covenant War.
The M555 Electromagnetic Launcher (then known as the X555 Electromagnetic Launcher Advanced Technologies Testbed) was first tested in classified operations during the Requiem Campaign, utilizing a hybrid of existing technologies and Covenant-derived pulsed power systems. The implementation of the new asychonous linear-induction motor and rail channels has proven itself in testing, and development costs has stayed within budget, though its precise mechanisms remain highly classified. Even with the new additions, the coilgun has seen little improvement in armor penetration from its predecessor, the M68 Gauss cannon. Misriah Armory promises that up-scaled versions of the new coilguns suitable for installation on armored vehicles and aerospace vehicles will conclusively prove the value of moving to a new architecture.
When detached, the M555 is loaded with 9 slugs. Carrying the turret decreases the player's speed and maneuverability to the point where he/she is invisible on the motion tracker unless the weapon is fired. Look speed is also drastically increased in comparison to other weapons.
List of appearances