 As all models of the Luger built after 1906 have the coil mainspring, they are known as "New Models".Older Parabellum pistols in German service were usually upgraded to the "New Model" specification.By 1906, the United States evaluated several domestic and foreign-made semi-automatic pistols, including the Colt M1900, Steyr Mannlicher M1894, and an entry from Mauser.