If I had a +30 modifier to my Craft (weapons) check, took a 10 on my check, and voluntarily increased the DC by 10 (I'm assuming the base DC is 20 for a complex/superior item) it would still take me approximately 8 weeks to make a single pistol. If I'm not an epic level character, it will take me substantially longer (about half a year for those who can just barely beat the base DC by taking 10).
Just some food for thought for when your gun explodes.
Yet another reason why my DM house ruled crafting time.