8 MJ LRG Rail Gun



The 105mm Rail gun, or the 8 MJ LRG Rail Gun as it was formally known, was a magnetic acceleration weapon used on the SP42 Cobra and as a weapon attachment upgrade to a standard UNSC prefabricated base turret. It primarily was designed for use against enemy fortifications, but excelled at taking down vehicles as well. When used on the Base Turret, the rail guns add a bonus antivehicle attack to the turret and possess the ability to deliver a super-dense 105mm slug at high speeds to disable vehicles. When used on Cobras, it was usually only fired when in a secure, locked-down position. It could deliver devastating damage at a very long range being able to destroy hostile vehicles with ease.

Trivia

 * "8MJ" may refer to 8 Mega-Joules, or the energy required to operate the weapon attachment, but this is just pure speculation.
 * Much like how the Base Turret's M202 XP Machine Gun may be detached at will, the Rail Cannons most likely can act as stand-alone weapon emplacements or be attached to other vehicles.
 * It is the only known actual railgun in UNSC's arsenal. Other magnetic acceleration weapons use a different principle of operation, known as a coilgun or a gauss gun.