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I could say many things about this subject, some of which have already been mentioned in this thread, so I will try to just mention a few key points.
I believe in the idea that anyone who owns a firearm should have a 10 day waiting period if they want to buy a dremel. In expert hands, a high speed rotary tool can save a lot of time. But a beginner can destroy parts plenty fast with hand tools.
I also want to discuss polishing feed ramps. Under most circumstances, polishing the feed ramp is not done for function. If everything is in spec, the feed ramp only needs to be pretty good for a gun to work reliably.
Most gunsmiths polish the feed ramp because doing so has become a mark of quality. People expect to see a mirror polished ramp on a hand fit gun, and custom makers oblige them. So the mirror polish is like the paint job on a Lamborgini. A great paint job is important for selling the car, but it does not make the car faster.
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