Green circle dot - Swampfox Kingslayer 1x22mm Micro Reflex Red Dot Sight

I own both the Sentinel and Liberty, and compared to those two, I'm no fan of the Kingslayer with green circledot. I purchased this optic with intentions to mount it onto the Ruger Mark IV picatinny, and did, but I quickly realized that this was not a great setting for it. With this particular model extended out to arms reach, the outer circle expands and begins to touch the very outer edges of the 22mm glass. Not a huge issue so long as I could remain perfectly still, otherwise the outer circle "falls off" the outer edge, which leaves a distracting view of dissappearing and reappearing segments of the outer circle. I moved the optic onto a rifle and the problem was resolved. The closer the optic is to your eye, the smaller the reticle, thus the more open the glass is. All in all, I now feel that the the main thing that this particular model has going for it is the battery tray. I do recommend the green circle dot model, but only for a rifle or shotgun.