Recently I bought a flat top 715t. Looking to add a red dot, but wish to put a riser on that allows for see through use of iron sights. Does anyone know what height riser to pruchase? I can find 1" risers, but when physically measuring it appears I need 1.5" and can't seem to locate one. Trying to avoid stacking risers. I'm sure someone else must have done this. Please share... Thanks! :?: