I use a 63B and Weaver Quad-Loc medium rings on my 336 30-30 and they were a perfect fit with a Bushnell 3200 2X7. A good solid mount system, light weight and fairly inexpensive too.
Brian in FL said:It all depends on whether your rear site folds down or not. If it does fold down, you should be able to use the Weaver base with medium Quad-Lock rings for mounting your 3 - 9 X 40 scope. If not, you might have to go with the highs. In any event, you'll find that the Quad-Locks are super rings at very reasonable prices. They're all I use any more, and you can find them at any WalMart. WalMart also sells the two piece Weaver bases that work very well also. I've used both the 63B's and the two piece bases and find that both work very well, except that the two piecers get too close together when mounted on a Marlin 1894. On a 336 or 1895 they're no problem at all. In fact the scope I have mounted on my Guide Gun is set on a two piece base.