Ultimax 100

Ultimax 100
Ultimax 100
	Ultimax 100 Section Automatic Weapon (SAW)
Type	Light machine gun, Squad automatic weapon
Place of origin	Singapore
Service history
In service	1982–present
Used by	See Users
Wars	Sri Lankan Civil War; Bougainville conflict; Yugoslav Wars; Anti-guerrilla operations in Indonesia & the Philippines; 2006 Fijian coup d'état; Solomon Islands coup; War in Afghanistan
Production history
Designer	L. James Sullivan for Chartered Industries of Singapore (CIS, now ST Kinetics)
Designed	1978
Manufacturer	CIS: 1982–2000; ST Kinetics: 2000–present;
Produced	1982–present
No. built	~80,000
Variants	See variants
Specifications
Mass	Mark 2: 4.75 kg (10.47 lb); Mark 3: 4.90 kg (10.8 lb); 6.8 kg (15 lb) when loaded 100 rounds;
Length	Mark 2: 1,030 mm (40.6 in) with buttstock, 800 mm (31.5 in) w/o buttstock; Mark 3: 1,024 mm (40.3 in) with buttstock, 810 mm (31.9 in) w/o buttstock;
Barrel length	Standard: 508 mm (20.0 in); Ultimax 100 para: 330 mm (13.0 in);
Cartridge	5.56×45mm NATO
Caliber	5.56 mm (0.22 in)
Barrels	Single barrel (progressive RH parabolic twist, 6 grooves)
Action	Gas-operated, rotating bolt
Rate of fire	400–600 rounds/min
Muzzle velocity	970 m/s (3,182 ft/s) (M193 cartridge); 945 m/s (3,100.4 ft/s) (SS109/M855 cartridge)
Effective firing range	100–1,200 m sight adjustments
Maximum firing range	460 m (M193 cartridge); 1,300 m (SS109/M855 cartridge)
Feed system	100-round drum magazine or 30-round STANAG M16 box magazine
Sights	Rear aperture sight and front post; 472 mm (18.6 in) sight radius

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. James Sullivan. The weapon is extremely accurate due to its constant-recoil operating system and is one of the lightest machine guns in the world.

Work on a new light support weapon for the Singapore Army began in 1978. 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. The Ultimax 100 (also called the U 100) is used in significant numbers by the armed forces of Singapore, Croatia and the Philippines. 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 (Squad Automatic Weapon).