America's Army: Special Forces/AK74 Modified Rifle
The AK74 Modified Rifle (AKS-74U) is the Opfor equivalent of the M4 SOPMOD.
When playing as an IF, one will usually acquire a Ak-74 with no scopes or GL; when teamed up with a sniper, the AK-74 is equipped with a scope.
Usage is more less the same deal as a standard M4.
More information may be found at http://world.guns.ru/assault/as03-e.htm