The more levels you have with the gun smith the more choices of perks you will get to pick from when the gunsmith delivers the gun next week. You get up to 3 choices depending on your rank. Rank 1 gets choice, rank 2 gwts to pick between 2 different set of perks. Rank 3 and above get 3 choices of perks.
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Ah I see! hopefully I have the choice of a decent perk then haha