The M6 series have seen major widespread distribution through the United Nations Space Command Defense Force as light firearms, although they are not always seen as primary weapons, because of their lighter penetrating power. They have seen usage in the UNSC for almost 140 years.[1]
The M6 series weapons are recoil-operated and magazine-fed, and typically fire 12.7 x 40mm projectile ammunition, and despite the large caliber, oftentimes "exotic" ammunition is not utilized. They are also remarkably large and overpowered to an extent, appearing to be redolent of a cross between a pistol or a rifle in size. In addition to power, the M6 line of weaponry is designed to be rugged and reliable, and the guns are able to remain operational after Slipspace transitions and high-g aerial maneuvers. However, the heavy weight limits its distribution amongst personnel, and the M6 weapons have a tendency to drop casings on the wielder's foot,[1] leading some UNSC personnel to favor the M7/Caseless Submachine Gun which operates on a caseless system.
They have remained remarkably unchanged during its decades of service, although there are a large number of variants, such as the A, B, C, D, G, and J variants. The M6 series handguns are issued in three different finishes: hard chrome, black polymer, and electroless nickel.[1]
Common slang terms for the M6 series handguns include go-mag, hand cannon, and power drill.[3]
Some variants of the M6 series have been 'up-sized' to be used by SPARTAN-IIs. The 'up-sizing' factor is 117%, a reference to John-117.
The fourth remark above could be a possible reference to the M1911 pistol of our modern times, a .45 pistol which has been around since 1911 and has changed very little in the time it's been in service.
The 12.7mm is identical to the real 500 S&W, having the exact dimensions of 12.7x40mm.
The M6 is cosmetically and mechanically similar to the IWI Desert Eagle, both using a gas cycled bolt and both having a slide that does not envelop the barrel.
The noise produced when it fires is a dull thud, which is lower pitched than most other human guns.
Magnum is a Latin word meaning "the great" or "the large".