The CIS 50MG is a gas-operated, air-cooled, belt-fed heavy machine gun developed and manufactured by Chartered Industries of Singapore (CIS, now ST Kinetics) in the late 1980s, in response to a request by the Singaporean Defence Ministry to replace the 12.7mm Browning M2HB machine guns then in ubiquitous service with the Singapore Armed Forces (SAF).

Class Manportable
Type Machine Guns
Manufacturer Chartered Industries of Singapore (CIS)
Production Period 1988 - 2000
Origin Singapore
Country Name Origin Year
Singapore 1991
Country Name Operational Year Retirement Year
Singapore View
ManufacturerName Production From Production To Quantity
Chartered Industries of Singapore (CIS) 1988 2000 View
Singapore Technologies Kinetics Ltd (ST Kinetics) 2000 View

The CIS engineers learnt from the lesson of the canceled (lack of funding) American "Dover Devil GPHMG" program Lead by Mark K. Humphreville, to create a modular weapon suited for modern tactical doctrines and production techniques. In 1988, CIS introduced the new 12.7mm machine gun which was aptly named as the CIS 50MG, after two years of development and testing phase.

As the CIS 50MG is a gas-operated, air-cooled, belt-fed weapon, the gun is operated using dual gas pistons, located in two gas tubes placed on either side of the barrel. The barrel is locked by means of a rotary bolt with multiple radial lugs that engages the barrel extension, eliminating the need for headspace adjustments. The CIS 50MG utilises the same "constant recoil" system used in the Ultimax 100 and it also has a quick-detachable barrel equipped with a carrying handle to facilitate the ease of barrel changing under combat situations or during operational manoeuvres.

Type Heavy machine gun
Place of origin Singapore
Service history
In service 1991–present
Used by See Users
Production history
Designer Chartered Industries of Singapore (CIS, now ST Kinetics)
Designed Mid-1980s
Manufacturer • CIS: 1988–2000

• ST Kinetics: 2000–present
Produced 1988–present
Weight 30 kg (66.14 lb) (complete gun assembly w/o feed chute and tripod adaptor)
Length 1,778 mm (70.0 in) with stock
Barrel length 1,143 mm (45.0 in)
Width 190 mm (7.5 in)
Cartridge 12.7×99mm NATO
Barrels Single barrel (progressive RH parabolic twist, 8 grooves)
Action Gas-operated, rotating bolt
Rate of fire 400–600 rounds/min
Muzzle velocity 890 m/s (2,920 ft/s)
Feed system Single sprocket Belt-fed with dual-feed chutes
Sights Folding leaf sight

End notes