Located in Pittsburgh Pennsylvania, General Manufacturing is a three-generation family owned and operated precision machining facility established in 1958 as a coal mine and steel mill repair and supply company. Today GMC has evolved into a Federal Contractor to the Department of Defense, and is a leading manufacturer of all three mortar mount systems (60, 81 and 120mm). We are dedicated to providing our War Fighters with the highest quality assemblies a soldier could ask for. ISO 9001:2008 certified and ITAR:M29377 registered, General Manufacturing Company specializes in value-added manufacturing services with a focus on quality. General Manufacturing Company was built on family values and to this day that pride is instilled in our employees and is shown in the quality of work our