I love everything about this optic - Swampfox Kingslayer 1x22mm Reflex Red Dot Sight

I purchased this model with the green circle-dot and I love everything about it. battery tray is on the side, so you can just throw a new one in without any adjustments. Easy to adjust and this thing can take a beating. I put this on my competition shotgun and has not lost zero. The green color optic makes a huge difference and the brightness options are perfect from lowest to highest to give you a good sight in any light conditions.