Did my own
I used a fine stone and got my 10-22 down to just over 2 lbs consistently. Before that you could pull a tree stump with it! Went real easy on the sear and must have reassembled and tested it over a dozen times until I was satisfied. If you're not affraid to do it, it worked for me. I went into it with the mind set that if it did not work or was not safe I would put in new parts. After a few years and countless rounds, no problem. If I decide to go farther, it will be replacing all those cheap plastic bushings with metal. They don't appear to be wearing, but the fit is a bit sloppy.