Stone laping is using a small fine wheting stone, by hand to smooth up the hamer latch cam, and trigger to hammer latch. The idea is not to take off too much metal, only to smooth up the machine/casting marks. Add a little gun slick. I would measure trigger pull before and after. satan has the deluxe trigger job, with pre travel adj. screw. Mine is just a smooth 3 1/2#.
If I were going to attempt a trigger job on the mini, I would do it by hand, slow, and easy. Do not use a dremmel, they can remove too much in a very short time, and it is easy to slip, Upps!
Just a warning. A botched trigger job can be a real danger! Ram fires, Unsafe safety, etc. The above is not meant to be a how to, on a trigger job, only a definition of Stone laping.