M6A magnum
From Halopedia, the Halo wiki
Template:Weapon The M6A Magnum Sidearm is a United Nations Space Command ground firearm. [1]
Now used mostly by the Civilian Security Forces, the M6A and M6B Magnum Sidearm are more comfortable to shoot then the other variants.
It is a model of Misriah Armorys M6 Series of sidearms.
Seeing as it is more comfortable to shoot, this may indicate a low caliber round, thus reducing recoil.
