Personally I will not put aluminum bases or rings on my firearms. So I couldn't tell you whether they will work or not. But I know for sure that steel ones work very well.

I like the one piece Warne base. IMO it is the longest base, and gives you alot of options for mounting your scope.

As far as low rings are concerned. Well a 40mm will normally fit. But it depends on how long the scope is, as well as the objective bell of the scope. You have to clear the rear sgihts as well if you leave them on the rifle. So the length of the scope is important there. Also the length can give you less grip to grap the plunger. So the objective lense is not the only variable.

Also if it is a variable sometimes the power ring can be in an inopportune position. That is another reason I like the Warne base which allows for a few different placements of the rings to adjust all these little things. Tom.