TheJULIET4 4x Magnifier is designed to work as a stand-alone magnification solution or in conjunction with reflex optics. In conjunction with a reflex optic, theJULIET4 can be adjusted for height through the use of spacers.
Lens quality and clarity are exactly what you'd expect from a Sig Sauer product. The fold over mount on the magnifier is tight with no slop and mates up perfectly with my Romeo optic. I have both Eotech and Aimpoint magnifier/optic combos and this is every bit of the same quality and performance of those brands.