Sun Sep 11, 2016 4:52 am
Have not fitted one to a Prosport, however...
The Rowan guys are very, very helpful, measure the vertical and horizontal of your stock's butt and give them a call (you could also send them a paper template drawing).
They produce different sizes, they look and function best when a little oversize (i.e. slightly larger than the stock).
TX200/Gary Cane/Sightron SIII 10-50x60
TX200/Gary Cane/Sightron SIII 10x42
TX200 test / analysis gun