The Sportmaster 512 series is a .22 caliber, bolt action, tubular magazine-fed rifle manufactured by Remington Arms between 1940 and 1967. The Sportmaster 512 has a 25" barrel, a one piece hardwood stock, and a blued metal finish. An interesting feature of this rifle is that it uses a tubular magazine and a bolt action. Most tube fed firearms typically utilize a lever action or a pump action. The Sportmaster 512 was part of the Remington 51x series of rimfire rifles consisting of the Targetmaster 510, Scoremaster 511, Sportmaster 512, Matchmaster 513, and 514.