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Trumpeter has released a one-off KV-2 that mounted a 107mm gun.

From Tanks-Encyclopedia.com: Perhaps the most interesting variant was a KV-2 armed with a 107 mm (4.21 in) gun. This was during a time when the superheavy tank concept was still being considered by Soviet leadership. There were no plans to serially produce a KV-2 with a 107 mm gun. Instead, just before the Siege of Leningrad, a KV-2 with a 107 mm gun was made and sent for fire testing in March, 1941. The 107 mm gun was going to be mounted on vehicles such as the KV-3, KV-4, and KV-5, but none of these projects left the drawing board as a result of the Siege of Leningrad. All 107 mm guns were destroyed and work on superheavy tanks was stopped.

Trumpeter’s Russian KV-2 with 107mm Zis-6 (07162) is a plastic armor kit of 80+ parts. It features rubber-band type tracks as well as a basic decal sheet. The model’s dimensions: 124.6mm (L) by 46.3mm (W).