M6 series

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"The M6 has been in service for about a hundred and forty years… it’s amazing to think how little it has changed in all that time."

- Anonymous UNSC Defense Force serviceman

M6 is a series of short-barreled weapons produced by Misriah Armory.

Introduction
They have seen widespread distribution through the United Nations Space Command Defense Force as lighter firearms, although they are not seen as primary weapons because of their lighter penetrating power compared to larger weapons and smaller magazine capacity, and are mostly issued to officer and vehicle crews.

They have seen usage in the UNSC for almost 140 years, and have been used in almost every conflict since then.

Characteristics
The M6 series weapons are recoil-operated and magazine-fed, and typically fire 12.7mm x 40 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 rendolent 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 manuevers. However, the heavy weight limits its distribution amongst personnel, and the M6 weapons have a tendency to drop casings on the wielder's foot, 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. M6 series handguns are issued in three different finishes: hard chrome, black polymer, and electroless nickel.

Series

 * M6A Handgun - Used mostly by civilian security forces, more comfortable to shoot.
 * M6B Handgun - Used mostly by civilian security forces, KFA-2 x2 scope, more comfortable to shoot.
 * M6C Magnum Sidearm - Halo 2-era UNSC sidearm, armed with semi-armor piercing ammunition, could lack scope due to amount of recoil from magnum rounds and it would be considered the standard issue UNSC pistol.
 * M6D Pistol - Halo: Combat Evolved-era UNSC sidearm, armed with high explosive ammunition and featuring KFA-2 x2 scope, it could possibly be the M6 special forces variant, explaining it's high power and why it was the only pistol used on the PoA (which was on technically a special forces mission) and would explain it's lack of use in H2 which was largly a conventional type ground warfare (no specops).
 * M6G Personal Defense Weapon System - Halo 3-era UNSC sidearm, armed with high explosive ammunition; would of replaced M6C in H3 due to the magnum's inefficiency which was improved upon by creating a new weapon based off of the specops pistol (M6D).
 * M6J Carbine - UNSC Army carbine variant of the M6 series.