Shield Sights SMS2 Glass 1x Reflex Mini Sight 2.0 - 4MOA Dot - The RMS2 is a compact, low-profile red dot built from aerospace-grade aluminum for strength and minimal weight. It handles heavy recoil, features fast auto brightness adjustment, and updated electronics for a clear sight picture. SHIELD footprint mount; Iron sight co-witness; No-click precision zeroing; Clear D-shaped lens; Aluminum construction; 17.1g lightweight; Auto brightness; 20,000-hour CR2032 life;