Both the optic mounts (RS regulate and the CZs) are quick release, so are easy to slide on and off the side rail. The RS Regulate, at least the original version, is two pieces (one angular side rail, other the Picatinny top) yet still lighter than the CZ mount. I like the RS a little better. The CZ seems industrial strong. If for some reason you decide you want the goofy looking high CZ mount (ISC), I've got one still in the box I'd sell for a good bit less than what Czechpoint charges. Only reason I could see for the high mount would be if you wanted to sight in a red dot or short scope for 100+yds, and irons at 25yds.
Lomx138