After assembling over 10 Kibler kits, all three types, I have never observed any of his locks that need any "tuning". Anything done to the working surfaces will be damage to a greater or lesser degree. Under no circumstances mess with sear and tumbler surfaces. These locks a highly finished and fit together like a swiss watch. No working surfaces will be improved by polishing to enhance function. Doing so is simply accelerated wear. You can not improve how they work by polishing or fixing anything. The CNC machined parts fit together with extremely close tolerances yet they are completely free to move as designed.
Jim Kiblers CNC locks are precision machines, they have nothing in common with the usual locks that are banged together from low quality castings.
I do cut rasp teeth on the jaws to hold the flint leather. I polish with #320 then blend with maroon Scotchbrite. The CNC finishes are excellent as received, no filing is needed. The only parts that have a tiny bit more to work to be done are the **** and frizzen. . The issue bead blast finish is actually fine as is.