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Regarding the spare parts, surely some enterprising person could start a machine shop dedicated to keeping these things running and make a few bucks? I mean, if parts are really impossible to get, why not buy a host and just start copying stuff? The patents have got to be expired at this point...
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Would be nice is somebody would. I think there are couple of issues the prevent this from happening.
There are not that many FNCs out there. My back of cocktail napkin math says there are ~6000 semis total that were brought in, of which roughly half have been turned into MGs if you go off the S&H serial number schema. Take high end numbers and there are 4000 MG hosts in the wild. Maybe half of those get shot on any regular basis. Figure a 5% failure rate a year and you have maybe 100 that break "something" every year.
Overall most people wait until a part breaks before they buy it. Look at Green Mountain. Folks moaned for years about not having spare barrels and when they did pop up on GB, they went for $500+. Green Mountain made a new run of barrels and it took them forever to sell out the first lot. There was a uzitalk thread about them being out of stock at one point and folks posting they wish they had bought one when they were available. I see the guy who made a run of titanium firing pins recently is still trying to sell them off on gunbroker as well.
A large percentage of FNC owners are buying them as entry level guns and are saving/scrapping up every last penny purchase the host in the first place. As a result a significant number of new FNC purchasers are not thinking about stocking up on spare parts when they first buy them. Those folks then eventually fall into the "wait until the part breaks camp", before they buy a spare part.
So ultimately somebody would do the community a favor and reverse engineering bolts, gas blocks, extractors, & slides and then make 100 or 200 of each. They would then probably sit on them for 5 years or more to sell them all off.
If there is one thing that would have been a seller, I would think it would be a 22 kit. Now with 22LR being $30 to $50 a box, even a 22 kit would probably be a slow mover as well.
My guess is that the economies are just not there or somebody would have done it.