Great red dot - C-MORE Railway Red Dot Sight w/ Standard Switch

Purchased this red dot for my S&W M&P 15-22 performance center rifle. It was easy to zero in and co-witness with the BUIS.
The sight is large and easy to use with both eyes open. I'm right handed and left eye dominant. With this red dot I can shoot accurately with my right hand keeping both eyes open. No more left hand shooting accompanied by right arm burns from hot casings. Amazing. The operation is simple to use, easy to adjust elevation and windage and holds zero. If you want a simple to use, easy to install red dot I recommend this red dot.