The M6 series are recoil-operated and magazine-fed. The ‘B’ and ‘D’ variants are issued with the smart-linked KFA-2 x2 scope. It fires 12.7mm x 30 semi-armor-piercing high-explosive ammunition (standard issue). M6 series handguns are issued in three different finishes: hard chrome, black polymer, and electroless nickel.
I think it did... but I was wrong about the 2x on the H3 scope... I think.. :$ops:
From Halopedia, listed under Halo 3 UNSC weapons:
It is a good weapon on its own and is somewhat similar to the M6D from Halo: Combat Evolved, but with a less power per shot, a slower rate of fire, no scope, and slightly less range. The M6G has increased accuracy and per-hit damage as compared to the M6C Magnum, but it has a much slower rate of fire. Just like the M6D and the M6C Magnum, the M6G will kill any unshielded enemy in a single headshot..