Grit

[ScoutMan]

We are all told that it is alright to polish sear and trigger contact points but not to change sear angles.

Question: What is the coarseist grit to start with just to polish; what is  the finist grit to finish with in order to stay out of trouble?

[Nobade]

I use a Gesswein ruby stone. It's probably 3000 grit or so, and is hard enough to cut hardened steel. (They're made to dress carbide cutters) If you had to use sandpaper, I wouldn't go any coarser than 1000 grit. You don't need to remove all the tool marks, just take the high spots and roughness off. On most guns, if you've removed all tool marks you've gone too far.

[gunnut69]

I use a set of ground ceramic stones. They provide a long life and a very fine cut. They are also ground to shape for better precision. They polish more than cut but do work quicklly. Nobade is quite right , we don't want to remove all the machine marks, just smooth the tops.. I do sometimes use 1000 grit wet-or-dry with water to polish large flat areas.. The paper is held on a piece of plate glass to provide a nice flat surface..