Ironsighter See Thru Mounts

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I currently have a Mossberg 500 12ga combo with the bead barrel and Improved Cyl. slug barrel. I am wanting to put a scope on the gun, but if I do this it will make it useless with the smoothbore regular barrel.

I am thinking of putting Ironsighter see thru shotgun mounts on so that way I can use the slug barrel with a scope and then if I change barrels I can use the "see thru" for the vent rib smooth bore for rabbit/squirrel etc...

What are your thoughts on this subject with wanting a scope on a 500, but needing to use both barrels?