It really depends on the trigger group. All sliding surfaces should be smooth, all sears sharp, everything square and true. I usually do it by sticking emery paper on plate-glass with water, then polish components as needed. Grit would be anything from 400 to 1200 or even burnishing stones. guns that get stripped and lubed often get a finer finish than work guns, my theory is that sears actually work on an oil-film, i don't know if it makes much difference down range though. lol.
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