The French Reibel Model 1931 machine gun, designed by Lt. Colonel Reibel, was used in French tanks in the World War II era and in fortifications such as the Maginot line built by France in the 1930s to deter invasion by Germany. It is gas-operated, firing from an open bolt in full automatic only, with a firing rate of approximately 750 rounds per minute. This example is meant for use in a JM twin mount which consisted of a thick, metal, square frame, sized to fit into a standard French fortification. It correctly has no front sight present and an adjustable rear sight. A charging handle is mounted to the right side of the receiver. Smooth pair of hardwood panels on the curved pistol grip. Includes a detachable 150-round side mounted magazine.