The highest serial number observed is 1054 (it is assumed numbering started from '1001', not counting the prototypes and pre-production examples). Barrels were supplied by the Panstwowa Fabryka Karabinow (State Rifle Factory) in Warsaw.

The wz.38M rifles were manufactured by the Zbrojownia Nr. Production was not resumed under the German occupation. It is believed only about 150 rifles of this pattern were completed before the German invasion of Poland. After a Polish army order was received, small scale production began in 1938. Several prototypes and pre-production samples of his rifle were manufactured from 1936 to 1938. 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 (1904-1985). (Kbsp wz.38M self-repeating rifle Model 38M), was a Polish 7.9 mm semi-automatic rifle used by the Polish Army during the Invasion of Poland of 1939.

Kbsp wz. 1938m