Recently I happened upon a pair of TPS/TSR rings. So I ordered them for my 5R. Only to learn they would not fit my Ken Farrell base. I called and spoke w/ Ken............he said I could ship it back and he would re-slot my base for FREE!!!! I would just like to say that it is nice to know there are people out there like that, he can rest assured he now has a repeat customer in the future!