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CIS 50MG: Wikis


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CIS 50 HMG.jpg
The CIS 50MG on display during Singapore Army open house 2007.
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[1]
Designed Mid-1980's
Manufacturer ST Kinetics
Produced 1988-present
Weight 30 kg (66.14 lb) (complete gun assembly w/o feed chute and tripod adaptor)
Length 1,670 mm (65.7 in) with stock
Barrel length 1,141 mm (44.9 in)
Width 190 mm (7.5 in)

Cartridge .50 BMG
Caliber 12.7 × 99 mm NATO
Action Gas-operated, rotating bolt
Rate of fire 400-600 rounds/min
Muzzle velocity 884 m/s (2,900 ft/s)
Feed system Single sprocket Belt-fed with dual-feed chutes
Sights Folding leaf sight

The CIS 50MG is a gas operated, air cooled, belt-fed heavy machine gun developed and manufactured by Chartered Industries of Singapore (CIS) in the late 1980s, in response to a request by the Ministry of Defence (Singapore) to replace the venerable 12.7mm Browning M2HB machine guns then in service with the Singapore Armed Forces (SAF).[1]

The aim was to have a brand new heavy machine gun design, that fires the same type of .50 cal rounds as the M2HB machine guns and to have the gun parts more readily available in view of easing SAF's chain of logistics and supplies.



The CIS engineers learnt from the lesson of the unsuccessful American "Dover Devil GPHMG" programme, to create a modular weapon suited for modern tactical doctrines and production techniques.[2] 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.[1]

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 utilizes 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.[1]


The one unique feature of the CIS 50MG is its dual belt-feed system, the system allows for fast and easy switching of ammunition from standard ball rounds to the Raufoss Mk211 Armor-Piercing-Incendiary rounds or the Saboted Light Armour Penetrators (SLAP), which are capable of penetrating a 25 mm thick RHA Plate at a distance of 1 km.[1][2]

Such systems are more commonly used in modern automatic cannons such as the M242 Bushmaster 25mm cannon, which is also in use by the SAF's Bionix AFVs.


Since 1988, the SAF has been using the CIS 50MG in its infantry regiments as well as a mounted weapon on several armoured vehicle types and several classes of naval craft in the Republic of Singapore Navy (RSN).[1][2] Also, the type was acquired in small quantity for use by the Indonesian Special Forces – Tontaipur.





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