Trijicon RMR Mount w/ Integrated Bright & Tough Night Sights.Trijicon offers two versions of the RMR Mount with Integrated Bright & Tough Night Sights for the SIG Sauer M17/M18: a Commercial variant (SG408-C-601124) and a Military Variant (SG408-C-601125). NOTE: Professional Installation Recommended. This mount with integrated back up iron sight is a fixed rear sight solution. To achieve windage adjustments for point of aim (POA) point of impact (POI) the gunsmith must drift the front sight left or right. Move the front sight in the opposite direction you wish the point of impact to move.Includes:Trijicon RMR Mount with Bright & Tough Night Sights for SIG Sauer M17/M18 (Commercial Version)Limited Lifetime Warranty12-Year Warranty on Tritium Lamps