based upon a VERY limited number of VERY simple sort of work. Really understanding what's involved, and being able to ALWAYS deliver primo results, takes a lot of specialized jigs and knowledge. It takes many hours of intense study, of each type of gun, to be able to consistently deliver such results. THAT is why there's almost no general gunsmith who can do top of the line trigger jobs on more than a very few different guns. Williams Trigger Specialties does nothing BUT trigger work, so of course his results far outreach those of nearly anyone else.