When was the company that developed the SIG MPX formed?
SIG MCX: The SIG MCX is a weapon series designed and manufactured by SIG Sauer, featuring a short-stroke gas piston system, carried over from the SIG MPX submachine gun. SIG Sauer:  The original company, SIG Sauer GmbH, is a Swiss-German firearms manufacturer and exporter, formed in 1976 as a partnership between Schweizerische Industrie Gesellschaft (SIG) of Switzerland and J.P. Sauer & Sohn of Germany.
1976