Johnson developed an operating system in which a relatively light bolt was attached to a counterweight that balanced it during recoil. Johnson examined various operating systems. For more than a decade, company engineers William Mason and Thomas C. In 1891, Winchester began an R&D program to develop a semiautomatic sporting rifle. Even more radical was the number of designers working on semiautomatic and fully automatic firearms. In the military arena, the new bolt-action, repeating rifles firing the recently developed small-bore, smokeless-powder cartridges were all the rage. It had the square receiver that was a trademark of all early Winchester semiautomatic rifles. Introduced in 1933, the Model 63 was the first semiauto rifle offered by Winchester chambered for the standard.
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