How many golden guns are in the game and what is their purpose?
I've played the first three chapters of the game, and until now I've just found one of the golden gun pieces.
How many of these guns are in the game? Do they have any purpose or is it just an "achievement" to collect all of them?
Solution 1:
Golden guns do 10% more damage and have increased clip size. I believe all of the guns get a golden version, each accessible in a particular mission.
Here's a location guide.