:cb2: I've tried the B-Square mounts twice and they weren't worth 2ยข (to put it nicely). When the first mount wouldn't work, they swapped out for a different mount one for a different gun. It didn't work either.
If you want a good solid mount that you can depend on year after year, check out E. Arthur Brown.
www.eabco.com/ He uses oversized screws in the mount for more surface contact, and it really holds. I sent him my Bisley and the scope, and he put it all together (Tri-Force mount and rings) for what I thought was a reasonable price way back in my young and stupid days. (I'm still stupid, but just not young anymore.) He does excellent work, but even if you go with someone else, do get a professional gunsmith to do the job right. You'll be glad you have a solid mount screwed directly to the frame rather than the B-Square. Save yourself a lot of time and frustration.