What is the purpose of golden guns? Is there a damage bonus, or does it just make them shiny?
After you collect all of them, you unlock the ability to have unlimited bullets. Also, each gun gets a nice (or crappy) golden color. You can turn that off if you want.
So each individual golden gun does nothing special?
At the very least, a lot can hold more ammo, for example the PT92 goes from 15 to 21 rounds in each mag. Apparently there's a damage increase too, but I haven't noticed one.
Fixing Turn10's omissions since 2007.
Golden guns increase damage by 10% and get roughly 20% more ammo in the clip.
But if you turn off the effects, you lose the bonus too! I wish you could keep the bonus but just turn off the lame golden gun look.
Where do you turn off the lame golden look?
There is no good. There is no evil. There just is.