Using the polishing setup described in our Part Polishing Notes, here's an example run on a Glock firing pin.
Before:

Here's the firing pin face — notice the grooves:

General cleaning/shine polish to all areas. Be careful not to remove too much material from the yellow (caution) areas and the firing pin tip.



The face area is what you want to get mirror-smooth.

All information posted here is for informational use only. If you make any modifications to your firearms based on this content, you do so at your own risk. Done incorrectly, this can render a weapon unsafe or unusable.
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