Ultimax 100

The Ultimax 100 is a gas-operated automatic weapon with a short-stroke gas piston operating system powered by ignited powder gases diverted from the barrel through a port in the gas block. The Ultimax 100 is a locked breech weapon with a rotating bolt that contains 7 locking lugs. It fires from an open bolt position. The bolt contains both a spring extractor and a casing ejector. The weapon's non-reciprocating cocking handle is located on the left side of the receiver and occupies the forward position during firing. The Ultimax 100 is striker-fired.

Tom Clancy's Rainbow Six 3: Raven Shield

The UM-100 is a weapon featured in Tom Clancy's Rainbow Six 3: Raven Shield.

Hailing from Singapore, the UM-100 machine gun holds the record for being the lightest 5.56 caliber machine gun in existence. Its unique constant recoil technology allows it to be fired one-handed or from the hip with minimal loss of accuracy. It uses a 100-round drum for ammunition, and can be fired with the butt detached.