[Imp]

No real idea but pretty sure its role was close defence as in stoping soldiers attacking from rear, possibly in the KV its manned (radio operator?) but the others would say its unmanned so you have to spot them & change tasks. So mounting as a BMG means its used all the time while in reality most probably never fired a shot hence they stopped fitting them. So still think range zero or one 360 degree weapon is more correct, by the time you spot them & man it they are on top of you. Could increase Acc or kill very slightly to represent fire at greater range I suppose though it should be less efective probably than German Nat thing