sentences:  Work on the SIG MG 710-3 machine gun (initially designated the Model 55, changed in 1957 to SIG MG 710) began in 1955 and its design was influenced by the MG 45, a late World War II development of the German MG 42 machine gun.These efforts resulted in the SIG MG 710-1 (adapted to use the 6.5×55mm round) and the SIG MG 710-2 (with the 7.92×57mm Mauser cartridge), while the prototype for the final production version which would become the SIG MG 710-3 (chambered in a standard NATO 7.62×51mm caliber) was completed by the mid-1960s.Currently the weapon is in use by the armed forces of Bolivia, Brunei, Chile, Liberia, and Liechtenstein.