The Ultimax 100 is a Singapore-made 5.56mm light machine gun, developed by the Chartered Industries of Singapore (ST Kinetics), and is extremely accurate due to its constant-recoil operating system. The Ultimax 100 is a gas-operated fully automatic weapon with a short-stroke gas piston operating system and uses a locked breech design with a rotating bolt. It fires from an open bolt position and has a non-reciprocating cocking handle located on the left side of the receiver that stays in the forward position during firing. 

This unit has become a bit of an armory queen. It has the following issues:

• Broken bolt carrier guide rod.

• Missing buttstock retaining pins.

• Missing gas system retaining pin.

• Missing mag release spring and button.

Click Here for a video from Forgotten Weapons about the Ultimax 100.