Back many years ago my whole family was really into archery. Someone at the local archery shop his bow through the crono and recorded the speed and disassembled the bow took the axels and bushings and simmered them in slick 50 for most of the afternoon and claimed a speed increase. Tried it on other bows and all had the same result. I think that in addition to all the methods mentioned here to smooth out rough machining, if all the internal parts as well as the bolt it self were treated in this way it would smooth every thing out and imbed the slick 50 in to the metal. A friend that is a pilot added slick 50 to a turbine crop duster (approved by the FAA) and had the idle speed go up 50 rpm.