The Midwest Industries MK2 QD RMR Mount features superior clamping technology that won't damage or mar rail surfaces with co-witness capability and smooth quick detach operation.Midwest Industries MK2 QD RMR Mount with Co-WitnessCompatible with Trijicon RMR red dot sightsHard coat anodized 6061 aluminum constructionPrecision machined for exact tolerancesTool-free adjustment with multi-faceted adjustment nutPatented smooth functioning QD lever by Elite DefenseFits rails not machined to mil-spec tolerancesBlack finishPerfect for tactical and sporting applications requiring quick optic deployment with backup iron sight co-witness capability and reliable damage-free mounting.