" class="post-image" style="height:auto!important;max-width:100%!important;"/>]photobucket Top base ia a Weaver 402 extension base. Bottom as you can see is a 46 base but I don't know the manufacturer. Two 46s(which I have although one is marked L46) with Leupold Rifleman Vertical Split rings should give you an outside the rings measurement of no more than 4 1/4". Below is what they look like assembled. I'm heading to town over the weekend and I'll see what find out about the bases.
til later
