You'll most likely need at least a singe-offset (one offset ring, one normal), and maybe a double-offset (both rings offset), ring set to mount those short-tube scopes.
Some Weaver bases, however, are non-concentric - have you tried reversing one (or both) of your bases, if you can gain some space(get the bases closer together) by doing so ? You might have to sacrifice some access to the top of the mag well with the bolt back, but maybe you can at least shoot it.