M6D Magnum

The M6D Personal Defense Weapon System is a semi-automatic pistol chambered in 12.7×40mm M225 Semi-Armor-Piercing High-Explosive rounds. It earned a reputation among UNSC operators as one of the most effective sidearms ever fielded — capable of defeating lightly shielded targets with a controlled pair at close range. The M6D ships with a built-in smart-link scope and a Titanium-A receiver, giving it substantially more rigidity than civilian-spec pistols. Its threaded barrel accepts standard-profile suppressors, and the locked-breech action handles the increased backpressure without cycling issues.