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Concept
Wz. 35 anti-tank rifle
Summary
The Model 35 antitank rifle (Karabin przeciwpancerny wzór 35, abbreviated "kb ppanc wz. 35") was a Polish 7.9 mm anti-tank rifle used by the Polish Army during the 1939 invasion of Poland. It was designated model 35 for its design year, 1935: It was also known by its codename "Uruguay", after the country (kb Urugwaj; or kb Ur) and by the name of its designer, Józef Maroszek(pl).
The weapon was initially a top secret project of the Polish Army, and was also known by various codenames. Until mobilization in 1939, the combat-ready rifles were held in closed crates marked: "Do not open! Surveillance equipment!". Another of the rifle's cover names was "Uruguay" (Polish: Urugwaj, hence Ur), the country to which the "surveillance equipment" was supposedly being exported.
After the fall of Poland, the German army captured large numbers of the kb ppanc wz.35 and renamed it "Panzerbüchse 35 (polnisch)" (abbreviated "PzB 35(p)"). The Italian army later received 800 of the captured weapons, renaming them "fucile controcarro 35(P)." Both names translate roughly as "anti-tank rifle model 1935 (Polish)."
In early 1940, one of the rifles, its stock and barrel sawed off, was smuggled out of Poland across the Tatra Mountains into Hungary for the Allies by Krystyna Skarbek and fellow Polish couriers. The rifle never saw service with the Allies, however. The drawings and specifications had been destroyed by the Poles during the invasion of Poland.
It resembled a rifle with a longer-than-normal barrel supported by a bipod at the front of the wooden stock. It was a Mauser style, bolt-action rifle, fed from a 4-round box magazine. The barrel had a muzzle brake to limit recoil. It absorbed about 65% of the shot energy, and the recoil was comparable to a standard Mauser rifle, even though the cartridge carried more than twice the amount of propellant. It had iron sights fixed for a 300-meter range.
Unlike contemporary anti-tank rifles, it lacked a pistol grip and fired a bullet with a lead core rather than an armour-piercing round with a hard core.
Official source
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