quick Disconnet Rings Pistol

[vietnam1947]

I have a S & W mdl 41 with a Weaver mount, and Bushnell Throphy red/green Dot Scope 30mm, WHAT quick disconnect Rings are suggested for this combination? I know where a pair of Weaver 30mm 49121 low mount rings are, jwill these work? I have tried the Weaver 49121 around the scope and there is apx 1/8 inch between the top ring and bottom ring is this normal? Thanks Fred