Sig Sauer Bravo4 4x30mm Graphite Illum. 5.56/7.62 Horseshoe Dot Reticle Battle Sight MegaView system utilizes an advanced prism and ocular design yielding 43% greater field of view than the competitive prismatic battle sights MOTAC (Motion Activated Illumination) provides for optimum operational safety and enhanced battery life The notably flat, distortion-free image boasts an unprecedented edge-to-edge clarity by means of a combination of Low Dispersion (LD) glass and aspherical lens design Dependable IPX-8 waterproof (to 400 mbar or 13 ft) and fog-proof performance M1913 Picatinny rail interface for night vision compatibility; Illuminated 5.56/7.62 Horseshoe Dot Reticle