The karabin samopowtarzalny wzór 38M (self-repeating rifle pattern 1938M, abbreviated kbsp wz.

Barrels were supplied by the Państwowa Fabryka Karabinów (State Rifle Factory) in Warsaw.

[3] The decision was made to begin serial production of the rifle at the Fabryka Broni arms factory in Radom in 1938.

However, it is unclear if any rifles of this pattern left the Radom factory before the German invasion (all the surviving examples display Arsenal Nr.

For a pioneering self-loading rifle, its design is strikingly advanced in its simplicity and functionality; for example, it's composed of several sub-sections interlocked by a single removable steel pin, and thus can be disassembled in moments.

Rifle has also interesting function similar to Czechoslovak ZH-29, where if the gun is loaded with charger clips the bolt can be released into battery with trigger pull.

)[citation needed] In April 2017, serial number 1048 was acquired at auction in excellent condition by the Polish Ministry of National Defence for $69,000.

According to the Maroszek relation, while personnel were evacuating from Instytut Techniki Uzbrojenia (Weaponry Technology Institute) the train they were traveling in was attacked near the city of Zdołbunów by two German warplanes flying at low altitude.

38M rifle, eventually killing the gunner and wounding the pilot of one of the planes, forcing it to land.