The Dual Handguns deal 12 damage per shot, whereas the starting Handgun deals 15 damage.
I wasn’t sure whether this is intended or not, but I assume not since the Uzi upgrade has much faster fire rate but still deals more damage than the Handgun.
What I expected to happen
Damage would be the same as the default Handgun, since ZM’s upgrades usually don’t decrease stats
What happened
Damage is 3 lower