Last year I attempted to use a WGRS-54 on my R7, found it was too low so gave up and took the FP-AG off my Ruger Blackhawk and have been using it on my R7.After buying the R9 from Dairyboy this fall I decided try the WGRS-54 again, this time with a 4mm riser from TEC-HRO.The risers fit the rifles fine but had to have a local gunsmith trim a little off the top dovetail so the WGRS-54 would fit.They are both mounted and zeroed in and working great now.