Design History
The choice of 128 mm was made because of the availability of tooling due to the use of this caliber on naval weapons, design contracts being awarded to Rheinmetall Borsig and Krupp, the first prototype guns were delivered for testing in late 1944. Rheinmetall began development on a variant of the 128 mm FlaK gun. whilst Krupp opted to design a new weapon from the ground up. After initial tests the Rheinmetall design was dropped and development continued with the Krupp design. However the service tests showed that a towed anti-tank gun weighing nearly 11 tonnes was impractical so the towed design was terminated.
Approximately 50 barrels and breeches were used on existing carriages. The weapon that used the ex-French GPF-T carriage was known as the K 81/1 while the K 81/2 used the ex-Russian carriage. Both of these designs were rushed, and were too heavy, making them cumbersome to deploy. In 1943 the design was started for a gun to mount on the Jagdtiger (Sd.Kfz. 186) and the Maus super-heavy tank was started using the Pak 44 as its starting point. This weapon of which approximately 100 were made was known both as the Pak 44 and Pak 80 / Panzerjägerkanone Pjk 80. Performance was identical to the initial design.
Read more about this topic: 12.8 Cm Pak 44
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