Now just a few questions about some guns, How much is the damage boost on each level for the Polaris? What guns get the best benefit from friendship gun potion? What guns for double tap?

What is +1 coolness in regards to cooldown? For example how many cigs would I have to smoke to fully fill up friendship gun potion to where there is no cooldown [testing this by the way later when I can]

With the item metronome what is the scaling? And stack with Polaris what could it do?

I don't know for Polaris's scaling.

Potion of Gun friendship boosts fire rate and reload speed so strong, slow single shot guns benefit the most.

Coolness is now capped at 50% so you can't completely eliminate the cooldown.

Metronome is garbage don't bother with it. It boosts a percent of the weapons damage until you switch guns, which is done automatically if you run out of ammo or find a new gun.

Metronomes effect stacks onto the gun you pick up its only lost when you switch when I tested it, but that was before the patch. So idk if it changed.

Here is a handy website with info about each of the items in the game: https://simonnguyen.github.io/