From Halopedia, the Halo wiki
The MK50 Sidekick is a powerful and compact semi-automatic handgun which fires 10mm rounds from a 12-round detachable box magazine. It is significantly distinctive from the UNSC's typically-employed M6 series in both form and function, as it lacks the hand-guard and typical smart-linked optic of the latter series, as well as being chambered in a substantially smaller ammunition type than the M6's 12.7mm rounds. The design of the MK50 is relatively simplistic, with a segmented slide and basic, analogue ironsights. A safety switch is present on the left side of the weapon, above the trigger-guard. Emerson Tactical Systems' emblem is worked into the grip. The MK50 used in 2560 by John-117 featured a matte black and olive green finish.
The MK50 can hold 12 rounds with at least 72 rounds in reserve. It appears to be headshot-capable and features a very rapid reload animation.
The Sidekick was designed by 343 Industries as a true sidearm pistol in mind, being lightning fast to draw and fire and acting as a reliable backup when the player's primary weapon is depleted. Compared to previous titles, the Sidekick was described being closest in function to Halo 2's M6C magnum. In April 2021, it was shown that the Sidekick had received a redesign since its reveal in July 2020. It would now include an underbarrel attachment similar to those featured on the M6C/SOCOM and the Tactical variant of the M6H2 magnum.
Halo Infinite coatings
List of appearances