This is a non-Uzi related story but I share it because I feel the business practice could be applied to the gunsmith market (sort of like what Lage Manufacturing does).
This may sound crazy, but in the late 90s and early 2000s, I was actually one of the go-to experts in a very specialized niche market. I restored Corgi Batmobiles. Up until Mattel managed to get licensed to manufacture Hot Wheels TV Batmobiles in 2007, the Corgi was the best die cast version of the TV Batmobile available for fans of the car between 1966 and 2007. The Corgi Model 267 appeared in 1966 with more than 4 million produced thru 1983. They had some cool action features and many Baby Boomers hung onto them well into adulthood. That was my customer base. I received a lot of emails from folks telling me stories about how they loved their Batmobiles and kept them since they were a kid or that they were upset when their mom tossed out their old toys when they were away at college, etc. and they wanted me to restore an old one to replace it, etc.
In the internet era, my fame spread sufficiently that I had far more requests (from countries all over the world) for my services than I could handle. So I kept a list of folks that wanted their Batmobile restored and I would only let people send me their prized Corgi Batmobiles if I felt I could get it done within the following 3 months. I don’t think I ever needed the full 3 months, but I wanted to give myself a cushion. I think it would be good if gunsmiths did something like that. You can still find traces of my work and one of my old webpages via Google searches. Here is one of my pages that a gentleman in France has preserved for it’s historical value:
http://www.batmobile.free.fr/Wayne-foundation/Eric7000.htm