Are both Craft(Firearms) and Gunsmithing necessary to craft a firearm / gunpowder / bullets?

[UN_observer]

Hi, as it came up in our last session, and I couldn't find a rule or a thread that specifically answered it;

Does a gunslinger in PathfinderRPG (not Pathfinder Society) needs both the feat Gunsmithing and at least one rank in Craft(Firearms) to be able to attempt crafting a firearm/gunpowder/bullets (yet applying the rules of gunsmithing to such attempt) or is it enough that she has the feat (Gunsmithing) alone to do such craft?

If the former is true, where can I find it?

Thank you very much for your input :)

[GM Rednal]

Gunsmithing: "You do not need to make a Craft check to create firearms and ammunition or to restore firearms."

So... I think it's pretty clear that all you need is the feat. XD However, Craft (Alchemy) is still necessary if you wanna make and use alchemical cartridges.