I've polished many, so I feel your pain. The quickest way is to start with 150 grit to remove all the casting marks and blemishes. Always use something to back your sand paper with, a sponge or even a popsickle stick to keep the lines straight and uniform. Then go to 320 grit till the sanding lines of the 150 is gone. Then go to 400 , 600 and 800. It will get progressively faster and shinier. After that, if you so chose , you can go to a cloth wheel and compound for a mirror finish.
If you have the luxury of power tools, a belt sander and a die grinder with cartridge rolls and a small flapper wheel will cut the time in half.
Parts like the trigger guard have a small radius and must be done by hand to really come out well.
The tactical bolt handle we sell comes to us as a raw casting, and must be prepped on a belt sander and a flapper wheel before we vibratory polish in a tumbler.
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