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The SM4 CQB is a weapon featured in the Athena Sword expansion of Tom Clancy's Rainbow Six 3: Raven Shield.

The SM4 CQB was designed in the mid-1980s with a focus on bringing a lot of power to bear in CQB situations. A recoil-operated automatic firearm, it has a unique trigger design that more closely resembles that of an SMG than a pistol.