Mortars are extremely situational and are already limited to two per squad. On top of that, they simply aren’t that effective. That’s why I think the M2 Mortar, Kz 8cm GrW 42, and BM-41 should all be moved to BR 3.
Look man, mortar spam is bad enough as is. Putting them at BR3? I Shudder to think of it.
I think the sweet spot for 80mm mortars is BR4. 50mm mortars can be devastating on the opening attack and they’re still okay in other situations up to BR3. I worry that the combination of 500lb bombs, 105mm howitzers, and 80cm mortars is too much HE spam for infantry to deal with in BR3. At least by BR4 your army should be fully equipped with semi-auto rifles and high-capacity full auto weapons so the squad wiping potential is high for everyone.
They have a very slow rate of Fire, and they have low infantry damage due to “armor penetration,” which causes most of the damage to sink into the ground.
Well, this will allow the weak Germans to destroy the strong kv-1)
Being 300+ meters away from him 
But then the Premium USSR squad with mortars will look funny.
It’s a pity that the squad can’t change guns…
I think it should be at least BR:IV. The mortar is good for tank defense, but no one uses it for that, because BR:V tanks are just a little too resistant. I think it would do better against T-34s and Panthers.
The main reason is that the tank is moving, so it is rarely used.
Well, if they increase the damage and range of infantry damage, reducing the damage to equipment in the “armor penetration” line, then these mortars will be just 5db.
You and I are on the same team