Just to give an idea of the quality of Granger guns using the aiglon system: I have a 1998 price list courtesy of JJ Perodeau, at that time with Champlin Arms in Enid, OK. (He's on his own now, but I believe still does some gunsmithing for Champlin.)

The Granger sidelocks are basically French "bests". The basic gun sold for $30,000 back then.