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The PÚV-6 (Pásový Útočný Vůz, 6válcový motor - tracked assault vehicle, V6 engine) is the evolution of the MU-6. After the MU-6 failure in 1934, the Škoda engineers tried to make something of the failed prototype and came with a solution unheard of at the time. They removed the turret completely, replacing it with very thin plates and installed a dual-purpose 40mm L/71 Z-1 prototype gun. This vehicle would now be used against both air and land targets. The suspension remained basically the same (minor improvements and engine tuning). While in theory the concept sounded reasonable and innovative, the vehicle was tested in 1934-1935 and the tests showed a huge number of flaws, including the unreliability of the running gear. What was even more surprising however was the low accuracy of the gun, because the long barrel tended to oscillate too much between shots. The result was that the Z-1 gun itself was never adopted by the Czechoslovak army despite its potential and the development of the vehicle was terminated in 1935.