12.8 cm Kanone 81(Ok-81/2) was once a German bulky anti-tank gun designed to struggle in opposition to bulky Soviet tanks like IS-2. The German military had encountered the Russian 122 mm weapons and had issued a demand for a related weapon. Roughly 50 barrels and breeches had been old on present carriages. The weapon that old the ex-French GPF-T carriage was once referred to as the Ok 81/1 presen the Ok 81/2 old the ex-Russian A-19/ML-20 carriages with cover and balancing equipment got rid of. the cradle and cringe device had been discarded and the 128mm gun was once fastened in a hoop cradle related to that old at the 81/1. Any other model Ok 81/2 was once additionally constructed, by which unedited Russian equilibrators had been retained.