Calico

From Rap Dictionary

noun

calico

A type of small assault pistol that fires 9mm rounds, famous for the large 50 or 100 round drum magazines that sit atop the weapon. But I will, wet niggas and wet women with the calico -- Z-Ro (Mo City Don), I got the calico with the black talons loaded in the clip. -- Notorious B.I.G. (Unbelievable)