I thought Greg at Southern Precision Rifles was the only one doing the bolt conversions, but I've been out of the loop the last year. I had one done as a 300 Blackout a couple years ago.
Is there a Serial number? If so get it and send it to Jerry at Schmidt and Bender, he'll tell you the history of the scope. I have a 3-12x50 PM II and he told me when it was made and what it configured with.