You probably don't do it with crappy equipment either.
You'd be shocked by the truth. It recently took me 4 months of constant bitching to get a new 60 degree dovetail file. My old one was so dull it removed material by the process of erosion rather than by cutting. The list of things I need that I'm constantly out of is longer than the things I have. Adapt, improvise and overcome is the motto here. I do know wtf I'm talking about here regarding the lack of quality in the Remlin leverguns.. Poor fit and finish, incorrectly indexed barrels/sights are CERTAINLY NOT machine shop issues. And rifles that don't function/feed correctly most likely aren't either. It comes down to poorly trained/unskilled/inexperienced gun builders just as I said. Denying it won't make the FACTS OF THE MATTER change one iota. Period.
