The headquarters of Opatów BCh district, lacking machine guns, decided to organize a serial production of the Bechowiec. This was possible thanks to the clandestine production of parts for the guns in a metalworks in Ostrowiec Świętokrzyski, without the knowledge of the German administration. These parts were produced there and, from October 1943, smuggled out by workers. Final construction of the guns was done in Strąpoć's village blacksmith shop, with primitive muscle-powered tooling. Barrels were made from scrapped World War I-vintage rifles, but they had to be hand-cut and rebored to 9 mm caliber.