Great optic and this version is $100 less. - SIG SAUER Romeo3 1x25 mm Reflex Sight, 3 MOA Red Dot

This is a great optic. I found two versions on this website, this one being the cheapest. I called Optics Planet and contacted Sig, but no one could explain the difference. Well I ordered it to find out. This model does not come with the low mount, only the 1.41" high mount. It also comes in a Sig OEM bag not a box. You still get the optic, rubber cover, battery, tools and owner's manual. This version is exactly what I wanted, just cheaper than the other model on this site.