The machine gunner also could not take magazines from other squad members who were equipped with M16s. The shape of the drum magazine also occupied more space compared to M16 magazines or the FN Minimi box holding a belt of 200 rounds. The drum magazine was bulky and difficult to reload without a special mechanism. The original Ultimax 100 was meant to be used with a drum magazine holding 100 rounds. Widespread adoption of the design might have been compromised by its feed system. The Ultimax 100's ergonomics are similar to that of the Thompson submachine gun, specifically the forward grip. The light machine gun was also designed to mount an M16-type bayonet and either day or night-time optics. An internal safety achieved through the proper arrangement of parts and mechanisms secures against premature detonation. The Ultimax 100 uses a manual safety mechanism that consists of a lever installed on the left side of the receiver (just behind the trigger) with two possible settings: "S" – indicating the weapon is safe and "F" – continuous fire. An unusual feature among modern machine guns is the fact the Ultimax was purposely designed to feed from magazines as opposed to belts. The machine gun feeds from a proprietary 100-round synthetic drum magazine (early models also used 60-round drum magazines), or from a modified 20 or 30-round STANAG 4179 magazine (from the M16 rifle). The magazine catch consists of two tapered pins on a bar, controlled by the magazine release button. ![]() If you just shoot at them, they will take cover and return fire, but if you start hitting them, they withdraw." A comment to the author by an experienced SEAL team leader aptly underlines the importance of having an accurate light machine gun: "Men react one of two ways when they are shot at. This article began by praising the Ultimax for its ease of control, which allows accurate fire. Jane's International Defence Review correspondent - Andrew Tillman, in an exclusive invitation from ST Kinetics to participate in the Product Improvement Program (PIP, initiated in 1989) to test fire the gun, elaborated: The overall design allows the bolt carrier group to travel all the way back without ever impacting the rear, instead stopping gradually along the axis of movement against the resistance of the return springs. The feature that grants the weapon its low recoil (compared to similar light machine guns) is the "constant recoil" principle. The weapon's non-reciprocating cocking handle is located on the left side of the receiver and occupies the forward position during firing. The bolt contains both a spring extractor and a casing ejector. The Ultimax 100 is a locked breech weapon with a rotating bolt that contains seven locking lugs. The Ultimax 100 is a gas-operated automatic weapon (capable of fully automatic fire only) with a short-stroke gas piston operating system powered by ignited powder gases diverted from the barrel through a port in the gas block. The Mark 3 variant is currently used in the Singapore Armed Forces primarily as a support arm, and is both classified and known by soldiers as the SAW (Section Assault Weapon). ![]() The Ultimax 100 (also called the U 100) is used in significant numbers by the armed forces of Singapore, Croatia and the Philippines. The weapon is produced by CIS (presently STK-Singapore Technologies Kinetics), initially in the Mark 1 version, later-the Mark 2, and currently, in the Mark 3 and Mark 4 variant. Work on a new light support weapon for the Singapore Army began in 1978. The weapon is extremely accurate due to its constant-recoil operating system and is one of the lightest machine guns in the world. ![]() The Ultimax 100 is a Singapore-made 5.56mm light machine gun, developed by the Chartered Industries of Singapore (CIS, now ST Kinetics) by a team of engineers under the guidance of American firearms designer L. Single barrel (progressive RH parabolic twist, 6 grooves) ĩ45 m/s (3,100.4 ft/s) (SS109/M855 cartridge)ġ00-round drum magazine or 30-round STANAG M16 box magazine James Sullivan for Chartered Industries of Singapore (CIS, now ST Kinetics) Light machine gun, Squad automatic weaponĪnti-guerrilla operations in Indonesia & the Philippines Ultimax 100 Section Automatic Weapon (SAW)
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