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The 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 variant of the MK 4, which was developed for the USMC's Infantry Automatic Rifle competition; the Ultimax lost to the HK M27.
It can be found as a collectible in South China Sea in the southeastern-most hallway underneath the second half of the split Titan. It is equipped with a Prisma and a Bipod. It sports an Atomic Naval finish.
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. Due to its magazine-feeding nature it may be also used more flexibly, as reloading is short and because it has semi- and burst-mode.
The U-100 MK5 as seen in the Battlefield 4: "Angry Sea" E3 2013 Gameplay Trailer.