Actually, there is another category which I feel can be considered "factory installed." I did business with Dick Sherburne, a well-known S&W dealer/distributor in western Massachusetts, back in the late 1960's and early 1970's. If I wanted target trigger, target hammer, red ramp, white outline, etc., Dick would take the new gun back to the factory where the service department would install the wanted goodies. I would have it back in a few days with a new label on the box showing the goodies installed. Of course, Roy's letter would show only how the piece originally was outfitted. I feel anything done by the service department before the gun was delivered to its final destination is legitimate.