The front/rear back-up sights comes with the fbs a low-profile, durable, auxiliary front sight.It is readily mounted on any 1913 picatinny rail, making it ideal for use on m4/ar-15/m-16 platforms.The sight can be used as a primary or back-up sight and the ergonomic angel-wing-shaped front shroud helps center the image with any rear sight.The rbs is a low-profile, durable, auxiliary rear sight.It is readily mounted on any 1913 picatinny rail, making it ideal for use on m4/ar-15/m-16 platforms.The sight can be used as a primary or back-up sight and the ergonomic angel-wing-shaped front shroud helps center the image with any front sight.Frame Material: Polymer/MetalFrame Color: BlackFirearm Fit: AR-15Style: Folding