Made in the USA without compromise, the HTX-1 is a truly revolutionary enclosed-emitter reflex sight built to the highest standards of quality and performance. Its patent pending Modular Chassis System (MCS) is compatible with almost all existing optics cut pistols and offers the lowest possible centerline, co-witnessing with standard height iron sights. With each optic comes an RMR Type A, RMR Type B (raised screw bosses), and GLOCK MOS mounting interfaces making it easy to mount to your pistol right out of the box.