I mounted this site on the site base of my Rock River M4 with Weaver 4X4 rings. It works very well for tactical shooting with both eyes open and for coyotes at 100+ yards. This is a lot of site for the money.

This sight works well on my Ruger MKIII Hunter. Dot size is small and nicely suited for plinking and hunting. Usually, I use brightness settings 6-10 during the day with polarized sunglasses on, and setting 1 indoors. No visible halo or fuzziness on the proper setting. This sight came with extremely ugly weaver rings, see through covers, an extension tube, and a battery. The rings seem sturdy, but the allen screws included look questionable. The covers are nice, and work with and without the extension tube. Personally, I think the scope looks goofy without the extension tube. So far, it has held its initial zero through about 2000 .22 Long Rifle cartridges (and many a rough Ruger disassembly!) using the included rings and screws. This is a great sight, at a great price. It would receive 5 bullets if it wasn't so eerily plain looking, included respectable rings and hardware, and had a slightly lower setting 1, only minor complaints though. I'm planning to buy the 25mm SP1 for comparison; it supposedly, has an even smaller dot.