Can you craft magic firearms with Craft Magic Arms and Armor without the gun-smithing feat?
closed as unclear what you're asking by KRyan, KorvinStarmast, T.J.L., ShadowKras, Adam Jan 24 '18 at 13:57
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You don't need the gunsmithing feat to do anything besides repair and restore the initial weapon you got as a gunslinger (if you have one). All other items the gunsmithing feat lets you craft you could already craft normally. Gunsmithing just bypasses the skill checks involved and gives you the option to make 400 gp/day from sale of ammunition (or you can keep some of that ammunition for yourself).