ZK 381: Czech Pre-War Prototype Battle Rifle

The ZK-381 was designed by Josef Koucký, his first design of 1938 (hence 381). This is one of the last of the Czech pre-war self-loading rifle projects, of which there were quite a lot. It uses a tilting bolt and a short-stroke gas piston, with ZB26 machine gun magazines and chambered for 7.92mm Mauser (although they would have been happy to offer a model in any other modern rifle cartridge). It was tested in the spring of 1938 by the Soviet Union, which liked it enough that they requested a model in 7.62x54R - and those were tested in November 1938. Ultimately domestic Russian designs were chosen instead, and tests in German, France, Spain, and Italy also led to naught.