Due to the secrecy involved in the rifle's development, the gun was initially housed in crates labeled as "surveillance equipment" with intended "export" to customer Uruguay. As such, the rifles were sometimes referred by the name of "Uruguay" or, alternatively, carried the name of chief designer Jozef Marosek and were therefore recognized as "Marosczek" rifles as well. Manufacture stemmed from Panstwowa Fabryka Karabinow, a sister establishment to the famous Lucznik Arms Factory in Poland.
In practice, the weapon gave good service - a rate-of-fire of up to ten rounds per minute could be reached and muzzle velocity was 4,180 feet per second. Penetration against early-war tanks (Panzer I through Panzer III) was good considering their lighter armor coverage and the rifles were pressed into service from 1939 onwards and issued to two-member rifle teams. Drawbacks included excessive weight and long length which weighed the operator down on marches or when relocating to a more advantageous position on the battlefield. If laying in ambush, the operator held a good chance to surprise an enemy tank and disable some portion of its design - track links, track rollers, engine components and the like.
With the fall of Warsaw and the defeat of the Polish Army by the Axis powers (ultimately to be joined by the Soviet Union in the East), remaining wz. 35 gun stocks fell to the Germans. Any engineering plans regarding this weapon were then destroyed by the retreating Poles lest they fell into enemy hands. In the German inventory the rifle was redesignated to Panzerbuchse 35 (polnisch) - abbreviated to PzB 35(p) - while those passed on to the allied Italians (about 800 examples) became known as Fucile Controcarro 35(p), the "p" simply signifying their Polish design origins.
KB wz.35 rifles were in service until the end of the war in 1945.
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