Ron, your advice is good and I did move the stop block to behind the front ring. Thanks for the recommendation.Since the scope stop holes are generally located towards the rear of the receiver, I thought that it was better, on an engineering basis, to anchor the rear ring. But I couldn't figure out a reason why that might be true! So after your recommendation, I asked B.B. Pelletier and readership what they thought and B.B. agreed with you. So yours and his opinion together, plus me seeing no reason why not, add up to a consensus. Thanks again for getting me over that thinking hump.Will