After the armistice, most M1917 rifles were placed in storage, although Chemical Mortar units continued to be issued them. During the 1920s and 1930s many M1917 rifles were released for civilian use through the NRA, or were sold as surplus. Many were "sporterized", sometimes including rechambering to more powerful magnum hunting cartridges, such as .300 H&H Magnum and .300 Winchester Magnum. It was so popular as a sporting weapon that Remington manufactured about 30,000 new rifles as the Model 30 from 1921 to 1940.