The Ultimax 100, also known as the U-100, is a Singapore-made light machine gun, developed by the Chartered Industries of Singapore (CIS, now ST Kinetics). It chambers the 5.56x45mm NATO cartridge. The MK 5 variant is an updated variant of the MK 4 Ultimax, which was developed for the USMC's Infantry Automatic Rifle competition; the Ultimax lost to the HK M27 IAR.
The U-100 MK5 is a light machine gun featured in Battlefield 4.
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 U-100 MK5 appears in the Battlefield 4 multiplayer as the first LMG for the Support class. Its initial attachments are an HD-33 sight, magnifier, muzzle brake, and bipod. It has a low rate of fire, moderate damage, and very good stability.
The stubby or potato grips further increase accuracy in full-auto, while the ergo and vertical grips help with mobility. Using an 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-automatic and burst-mode.