How is weapon damage calculated (with in-game weapon mods)

[OddballE8]

So if the weapon has a base damage of 30, and I look at the reciever mod and it has a value of 37.

Does that mean that the weapon will have a base damage value of 37 with that mod added or is there a calculation made based on the 37 value?

[OddballE8]

Nobody knows?

Surely someone knows, we've had a few weapon mods out there already.