Functionality Īs with most human weapons, the M6D is discharged when a trigger positioned at the top of the grip is depressed by the index finger. Various kanji characters can be observed in different locations on its body. The length of the magazine, which integrates a prominent grip extension, makes the weapon appear comparatively very large. The M6D is relatively distinctive among the M6 family, most notable for the brown hue of the grip, which features small bumps across its surface. M6Ds are produced with a distinctive hard chrome finish. Like other officer's model M6s, the weapon is fitted with smart-linked KFA-2 optic for utilization by those employing a heads-up display. The M6D is also an officer's model, and in this capacity was employed by Captain Jacob Keyes on the UNSC Pillar of Autumn. The M6D is one of the M6 series' upscaled variants, being larger than non-upscaled M6s by roughly 117%. The weapon is somewhat unusual for a handgun in that it is capable of both semi-automatic and automatic firing. It has also been known to be chambered in the. The M6D is a recoil-operated, magazine-fed handgun, chambered in 12.7x40mm ammunition, typically employed with semi-armor-piercing, high-explosive (SAPHE) rounds of that chambering, and feeding from 12-round detachable box magazines.