HIGH PERFORMANCE - Extend your effective range while maintaining the speed and flexibility of a red dot with the JULIET4 4x Magnifier; This magnifying scope is designed to work as a stand-alone magnification solution or in conjunction with reflex optics ADJUSTABLE HEIGHT - This Adjustable Magnifier provides customization for red dot sight combination; In conjunction with a reflex optic, the SIG SAUER Magnifier can be adjusted for height through the use of the included spacers (1.41", 1.53", and 1.63")