I bought my Gov't Model used, and really don't love the sites. But whoever owned that took good care of it, and the trigger is amazing. If I knew what I was doing I'd tKe it apart and check it out. I'll have my Dad look at the internals when he's here this winter. It is a Series 80, but feels as sweet as my new Wiley Clapp. Maybe it is just the age and being broken in well. I shot lights out with that gun.