The Karabin przeciwpancerny wzór 35 (Anti-tank rifle, pattern of 1935 in English), more commonly known as the kb ppanc wz. 35, is a Polish anti-tank rifle.
The rifle was created in 1935, and when deployed, the rifle was supposed to be a top secret. Due to this, it was given multiple codenames, such as "kb Urugwaj" (Uruguay) or by the name of its designer. The combat-ready rifles were shipped in high-security crates, with "Caution! Do not open! Surveillance equipment!" on them.
While the rifle was rolled out successfully in 1939, the rifle still had to be kept a top secret, and soldiers who were trained to use the rifle were taught in top-secret facilities, and had to swear to keep the secret.
In early 1940, one of the rifles, with its stock and barrel sawed off, was smuggled out of Poland across the Tatra Mountains into Hungary for the Allies by Krystyna Skarbek and Polish fellow couriers. The rifle, however, never saw service with the Allies. This is because the drawings and specifications were destroyed by the Poles during the invasion of Poland. As a result, reverse engineering would have required too much time.
The rifle uses a K98K action, with a few modifications to help it sustain the higher pressure produced by the cartridge.
The kb ppanc wz. 35 was used in certain countries under different names, like "Panzerbüchse 35 (polnisch)" in Germany and "Fucile Controcarro 35(P)" in Italy. Germany then integrated the cartridge into their Panzerbüchse 39.
The kb ppanc wz. 35 appears in the game Enemy Front, where it is hand-held; the actual weapon is not meant to be held with the hands or fired from the hip.