This why a custum gun cost so much because one guy will build a gun and if something wrong with it that guy fixes it KIMBER LES BEARA SO ON AND SO ONA backup plan:
This is pretty much why I say become a machinist with an eye towards gunsmithing. If you can become a proficient machinist then wish to use those skills as a gunsmith, good for you and your much farther down the road to doing quality work on guns.
As a competent machinist you can make a good living and be in demand almost anywhere, though only the larger cities will have higher pay scales.
If things don't work out as a gunsmith, you can still make a good living as a machinist.
What will make him a success as a Gunsmith?
Skill.
If you do top end work and don't screw things up the work will find you.
The limiting factor is how many customer guns you trash. Make mistakes with a cutting head going 800 rpm while trying to cut a new dovetail for a sight and it can go wrong quickly.
One false move with a file and it skitters across a barrel and you can't get those file marks out, how you going to explain that to a customer?
Working on guns as a gunsmith is a no second chance undertaking.
Many "would be" amateur gunsmiths do more harm then good and it comes 90% when they are trying to disassemble things.
Many so-called Gunsmiths can't even do something as simple as punch a sight out of a dovetail without putting scratches on your gun, google that if you want to read about "stupid Gunsmith tricks" for an afternoon.
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