The really short answer to your part dilemma is that if you find a fella that can make it, like as not, you will flinch at the price he has to charge to afford to do so. Pretty simple economics.
The guy you want to talk to, runs a machine shop, and who is willing to take on a 'one of' job, and be willing to make gun parts. He'll want accurate blueprints/drawings, with material specs and heat treatment requirements, as well as reasonable dimensional tolerances. Got those?
What gun, what part? Have you tried a WTB thread in the appropriate category in the Equipment Exchange.
Would you be upset if you took a Morris Minor (uncommon, older model and make of car, chosen off the top of my head) to the local corner mechanic, and found that he would not actually make the parts he could not buy for it? Why the concern here? Same same. Mass produced to a price. Parts no longer available. Not a hard thing to figure out once you think on it some.
I think a lot of the whole problem is a deep misunderstanding of what and who a Gunsmith is, and how he makes a living, esp. these days.
I heard a saying about Blacksmiths. You have a Blacksmith in your town? No? Think on that. The saying went along the lines that a Blacksmith could make anything except a living at it. That about sums up that. Gotta make a living. If you cannot charge what your time is worth, one had best enjoy their hobby of supporting other folks hobbies. Which is exactly what a Gunsmith that does not charge out what the time is worth, is ending up doing.
Cheers
Trev
I still do some parts and machining at the shop. Had o make a thread protector for a browning with a boss on the end. The guy didnt want the boss replacement so I made one. For a real cost it wojld have been about 100 to 130 $ in labour not including cost of material. (Lathe work, polishing, sandblasting, and finishing it to look nice) took about 4 to 5 hours to make it out of the material that was available.
People want custom parts but dont seem to want to pay for it. Id love to have my own shop to make custom target rifles. But with no name for myself let alone start up funds it just would not work (no bank is going to fund a gunsmithing start up)