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The UM-100 is a weapon featured in Tom Clancy's Rainbow Six 3: Raven Shield. It was introduced in the Iron Wrath expansion.

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.