The NcStar VISM Flipdot M2 is a folding open reflex red dot with integrated backup iron sights. The lens flips up and auto-powers on, then folds flat into the body when not in use, leaving the rear sight in the unit and the front post on the frame. It projects a 3 MOA red dot and adjusts in 1/2 MOA clicks. Features: Folding (flip-up) open reflex red dot with backup iron sights 3 MOA red dot, 1/2 MOA windage and elevation clicks Lens auto-powers on when flipped up, folds flat when stowed 22x16mm lens CR2032 battery, approximately 1 oz RMR footprint Includes a Glock MOS plate and 2mm RMR spacer The RMR footprint plus the included MOS plate and spacer let it mount to RMR-cut slides and Glock MOS slides.