Ultimax 100
Country: 
SingaporeManufacturer: ST Engineering Land Systems (ex-CIS)
5.56×45 NATO squad automatic weapon designed by L. James Sullivan, famous for its constant-recoil system which drastically reduces felt recoil and allows highly controllable automatic fire.
Ultimax 100
Community
Data trust
- Reliability
- Unverified
- Sources
- Sources pending review
Identity
- Designation
- Ultimax 100
- Alias
- U100
- Manufacturer
- ST Engineering Land Systems (ex-CIS)
- Country
- Singapore
- Year
- 1982
- Category
- Light machine gun
- Status
- In service
Ballistics
- Caliber
- 5.56×45 mm NATO
- Muzzle velocity
- 970 m/s
- Rate of fire
- ~500 rpm
- Effective range
- 800 m
- Maximum range
- 1300 m
Dimensions
- Barrel length
- 508 mm
- Overall length
- 1030 mm
- Empty weight
- 4.9 kg
Mechanics
- Operating system
- Presa di gas, pistone lungo, constant-recoil
- Bolt / action
- Otturatore rotante, sparo a otturatore aperto
Feed
- System
- Tamburo amovibile o caricatore STANAG
- Standard capacity
- 100 rounds
Fire modes
Historical profile
Developed by Chartered Industries of Singapore (later ST Kinetics) between 1978 and 1982 under the direction of L. James Sullivan, co-designer of the AR-15.
Adopted by the Singapore Armed Forces as the squad SAW; exported to Croatia, the Philippines, Slovenia, Indonesia and Zimbabwe.
The constant-recoil principle suspends the bolt before it impacts the rear of the receiver, eliminating the recoil spike and keeping the weapon on target even in full-auto.
Variants
Main users
Singapore · Croatia · Philippines · Slovenia · Indonesia · Zimbabwe
Key components
- ●Stock — Shoulder rest.
- ●Receiver — Weapon body with internal mechanisms.
- ●Grip — Primary grip.
- ●Magazine — Cartridge feed.
- ●Barrel — Guides the projectile.
