Just bought a 75 on GB. Was advertised as sporterized and missing some parts so I got it cheap. I am not familiar with the 75 but it looked straight forward to disassemble. After some struggle I got it apart to find a trigger pack. I was looking at numrichs and noted the 75 has no trigger pack. I then saw signs of careful machining and stock inletting. Checking schematics for the 52d I came to the conclusion some careful Smith had fit a 52 trigger to a 75. Anyone ever see this?