The wz.38M, designed by Józef Maroszek, was the winner of Poland’s 1934 self-loading rifle trials. Production began in 1938, but only about 150 examples had been produced when Germany invaded and production was halted. Only 2 examples are known to survive to this day, one in a private collection and one in the Polish Army Museum.
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Looks like a ZH-29 copy with a more conventional bolt design. It’s a shame Germany tried to destroy them all, this looks like a good rifle.