materia question

[Viladin]

Hi everyone I am new to the forums and the game. I have been playing pathfinder for awhile so I am familiar with the rules in general but i had a question about materia slots. My GM is under the impression that the materia slots listed for weapons and armor are max slots after mastercraft. I told him i thought the slots listed on the table are the base slot and that you could add more slots through mastercraft. Could someone please help clear this up for us thanx alot.

You are correct, although, I did take out the Mastercraft design after switching to Pathfinder. But I suppose you could infer that masterwork could add a slot.