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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 U-100 MK5 appears in the Battlefield 4 multiplayer as the first LMG for the Support class unless the camaign the has already been completed in which case the M249 is also available. It's initial attachments are an HD-33 optic, Magnifier, Muzzle Brake, and bipod.
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.