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There's a quote with a link to that further up this page.

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I had a well respected local gunsmith polish and reblue a Commander size 1911 clone.  He rounded off the extractor hole and then tightened a grip screw down so much that it was jammed into the bushing.  When I took the grips off, the bushing came out with the screw.  I will never use or recommend him again.

I once had to threaten to sue a well known former gunsmith that had been recommended in Peterson's Handguns just to get my two S&W pistols back.  I had sent them in for trigger jobs.  It wasn't 14 months, but just a hair shy of a year.  I was originally quoted 3-4 months, and starting at month 6 I keep getting promises that weren't kept and the run around whenever I called.  I honestly thought they had lost both Smiths, or they were stolen, and they didn't want to let me know.  After 11 months, including 5 months of excuses and broken promises, I sent the company a letter telling them that I wanted the guns back, fixed or not fixed, or I would sue to have them returned to me.  FWIW, that gunsmith worked for a company, and they did have clerical staff and counter staff that helped him out.  Communication was non-existant there.  In hindsight, i'm glad I threatened to sue, since that smith left a couple of months later and who knows when I would have gotten my guns back!

A buddy and I both had ex-91/30 Mosin-Nagant snipers that we wanted to turn back into snipers.  We took them to a local gunsmith that specialized in rifles to have the screws drilled out and holes retapped.  I even provided the bits and tap to the smith.  The smith looked it over and said it wouldn't be a problem for him.  When we went to pick them up, he had charged each of us an extra $100.  It turns out that he burned out his drill press motor drilling the screws out, and charged us for a new motor.  When we objected, he said it was either pay the money or he will keep our guns.  We paid, but I swore that I would never use him again for anything.  IMHO, he was stupid.  He got us for an extra $100 each, but he probably lost thousands in additional business we would have given him or recommended to him.  This smith was also a big racist.  When we picked up our rifles, he bragged to my friend and I that if he saw a black man pull up to his shop, he'd lock the door since he wouldn't do any work for *******.  After my dealings with him and listening to his rant, I thought he was a scumbag and swore that I would never use him for anything or recommend him to anyone.

After these experiences, I either do my own work (including learning how to do something) or just do without.

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That's not a thing...

unless you are talking about a business license...

Just like the the term "Master Gunsmith" in America

If you are not part of the https://www.acgg.org/ and have not gone through he process of becoming a "Master gunsmith" (Basically proving your master skills) you are not one. (This is not a law/rule just my opinion)

I am a gunsmith...I am not a master gunsmith...