Two or three hours careful work with some fine ceramic stones to remove burrs and complete the finishing of surfaces which work against others end in a nicely working gun
THIS is the key, use stones and take your time with a sear and tumbler, and do it
by hand. I have seen several examples of folks who went in with some aggressive abrasives, or..., power tools and gritty media (AAAAH
) and polished the parts alright..., but messed up the angles of interface..., so completely ruined the full cock notch and sear where they met. Went from a heavy trigger to a gun that wouldn't hold on full cock and/or would slip off of half-cock. Imported parts ain't cheap nor easy to find when you're in a hurry. As the man wrote..., you can improve a gun quite a bit, just take your time and don't overdo it!
LD