Grace Optics M2 Topless Red Dot Sight (3 MOA Reticle)The M2 has a topless design designed to give you a wider field of view, resulting in quicker target acquisition and more accurate shooting. RMR Footprint The M2 uses the RMR footprint and comes with a Picatinny rail mount. Light Sensitive The new M2 is light sensitive, meaning the brightness of the dot is adjusted but the outside light. This helps with harsh light conditions as well as battery life. Light Sensing Technology The light sensing