This product is build out of very cheap materials; it is not worth the asking price. A higher quality impact plastic lenses like is used in eye glasses would be much better. Also needs to be tinted light yellow, Teflon coating, anti-glare coating and a sun shield added for shot into sun light.
I bought this kit for my HHA 5500. Installation is a snap and my old eyes can now see the pin and the target with no distortion! I would recommend the 4X or 6X for older shooters.
A definite help in making my shooting more accurate. Just enough magnification not to distort view when looking beside the site to locate & confim target before settling in for shot.