FAB Defense FXFRBS FrontRear Folding BackUp Sights for AR15 M16 M4 Low Profile Dual Aperture Rear Sight Black Polymer and Metal

The FrontRear BackUp Sights comes with the FBS a lowprofile durable auxiliary front sight. It is readily mounted on any 1913 Picatinny rail making it ideal for use on M4AR15M16 platforms. The sight can be used as a primary or backup sight and the ergonomic angelwingshaped front shroud helps center the image with any rear sight. The RBS is a lowprofile durable auxiliary rear sight with Dual apertures are 3mm for longer eye relief mounting low light and faster target acquisition and 1.5mm for shorter eye relief mounting and greater accuracy each is instantly selectable to match conditions. It is readily mounted on any 1913 Picatinny rail making it ideal for use on M4AR15M16 platforms. The sight can be used as a primary or backup sight and the ergonomic angelwingshaped front shroud helps center the image with any front sight.