[1] Another of the rifle's cover names was "Uruguay" (Polish: Urugwaj) or Ur in short, the country to which the "surveillance equipment" was supposedly being exported.

On 15 July 1939, there was issued an order to show the rifle to selected groups of sworn marksmen from all infantry and cavalry units, with a short training.

[3] After the fall of Poland, the German army captured large numbers of the kb ppanc wz.

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.

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.

The high energy was due to the relatively long barrel, and nitro powder giving a muzzle velocity of 1,275 m/s.

The downside was that since the bullet itself was not designed to penetrate, it could not be filled with an incendiary component and used to ignite fuel tanks, or filled with tear gas (as used by the similar German 7.92×94mm Patronen anti-tank rifle cartridge), which was intended to force the crew to evacuate, or at least greatly reduce their combat effectiveness, even if no-one was hit by the bullet itself.

35 used an oversized cartridge case mated to a rifle-caliber 8mm bullet, giving very high velocity at the expense of hitting power.

Simultaneous to the development of the ammunition, a young graduate of the Warsaw University of Technology, Józef Maroszek, was ordered to design an anti-tank rifle.

On August 1, 1935, the Committee of Equipment and Armament officially ordered the rifle and in October the first tests of the new weapon commenced.

The rifle was based on his thesis project Karabinek KP-32, which was a reworked and simplified Mauser Gewehr 98, with the action scaled-up to sustain the higher pressure and length of the new cartridge, as well as the barrel lengthened significantly.

The committee accepted the new design on November 25, 1935, and in December the Ministry of Military Affairs ordered the delivery of 5 rifles, 5000 cartridges and a set of spare barrels for further tests.

After the tests carried out by the Centre of Infantry Training in Rembertów proved the effectiveness and reliability of kb ppanc wz.

The rifles were kept in closed wooden crates, each marked with a number and a notice "Do not open; surveillance equipment".

During a mobilization, starting from 28 August 1939 it was ordered to issue rifles to units, and to train additional soldiers, still in secret.

[citation needed] Germany replaced some of the captured Polish DS ammunition with their own 7.92 mm hardened-steel-core bullets.

[12] In 1941, Germany transferred PzB 35(p) to the Italian armed forces,[11] which used them in combat under the designation Fucile Controcarro 35(P) until the end of World War II.

[citation needed] The German Army recaptured some of these rifles after the Italian armistice and designated them as PzB 770(i).