The Pistol is destroyed if it exploded. (Unless it is magical then it just wrecked.) So I would think you would have to craft a new pistol with your gunsmithing.
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if it is wrecked you can get a "make whole" spell for 60gp in pfs. the rules mention using gunsmithing feat to fix a wrecked firearm as well:
Early Firearms: If an early firearm with the broken condition misfires again, it explodes. When a nonmagical firearm explodes, the weapon is destroyed. Magical firearms are wrecked, which means they can't fire until they are fully restored (which requires either the make whole spell or the Gunsmithing feat).
though gunsmithing feat doesn't clarify this, and I am not sure how this would work in pfs-- anyone know if this was ever ruled on? though 60gp is cheap so maybe it doesnt matter...
but yeah, double pistol explosion before you can get the +1 to it seems a real bummer...