The Calico M960A is an American selective fully automatic submachine gun (SMG) based on the Calico M950 with the addition of an extending butt and a forward grip. It is chambered for the 9×19mm Luger which takes 50-round or 100-round helical magazine which fits on top of the rear of the receiver. The M960A was first produced in 1990, and its rate of fire is 750 rpm. References 9mm Parabellum submachine guns Roller-delayed blowback firearms Submachine guns of the United States Trial and research firearms of the United States