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The safety lever is located on the right side of the receiver, just above the trigger. It has a ten-round non-detachable magazine loaded from Mauser stripper clips.
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It features a Browning/Petter system in which the bolt tilts up to lock in the case of the Kbsp wz.1938M, against the front edge of the ejection/loading aperture in the top of the receiver. The rifle is gas operated with the gas tube located under the barrel. This is perhaps the only indication Maroszek rifles were reissued to Nazi forces. Maroszek stated he had seen a group of German soldiers armed with wz.38M rifles in occupied Warsaw. 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. The decision was made to begin serial production of the rifle at the Fabryka Broni (the Arms Factory) in Radom in 1938.
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