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The Ultimax U-100 MK5 is a Singapore-made 5.56mm light machine gun, developed by the Chartered Industries of Singapore (CIS, now ST Kinetics). The MK 5 variant is an updated version of the MK 4, which was developed for the USMC's Infantry Automatic Rifle competition; the Ultimax lost to the HK's M416-based M27.
The Stubby or Potato grips further increase accuracy in full-auto, while the Ergo and Vertical grips help with mobility. Using a Angled or Folding grip completely cancels out the first-shot multiplier on the U-100 MK5, enabling accurate tap-fire and tight shot grouping in short bursts.
If iron sights are used in multiplayer, a rendering bug may occur whereas the sights do not show up for a few brief moments in a similar fashion the F2000 bug in the Battlefield 3 co-op mission The Eleventh Hour.