DD DAGGER DEFENSE Dagger Defense tactical flip up BUIS picatinny rail mounted backup iron sights. Tactical picatinny rail mounted BUIS Aluminum alloy in black matte finish Spring loaded flip up feature Great back up iron sights for red dots Fits most standard picatinney rail systems Tactical picatinny rail mounted BUIS Aluminum alloy in black matte finish Spring loaded flip up feature Great back up iron sights for red dots Fits most standard picatinney rail systems Requires a front sight tool for adjusting the front sight post (not included)