The decision was made to begin a serial production of the rifle at the Fabryka Broni (the Arms Factory) in Radom in 1938. The highest serial number observed is 1054 (it is assumed that the numbering started from '1001', not counting the prototypes and pre-production series). The barrels were supplied by the Panstwowa Fabryka Karabinow (the State Rifle Factory) in Warsaw. The wz.38M rifles were manufactured by the Zbrojownia Nr. The production was not resumed under the German occupation. It is believed that only about 150 rifles of this pattern were manufactured before the German invasion of Poland.

After a Polish army order was received, a small scale production began in 1938. Several prototypes and pre-production samples of his rifle were manufactured from 1936 to 1938. Józef Maroszek was one of the three winners of Poland’s 1934 self-loading rifle trials. He was known mainly as a designer of Polish anti-tank rifle wz.1935 'Ur'. The rifle was designed by a Polish engineer Józef Maroszek.

Kbsp wz. 1938m