FAB Defense FXRBS Rear Back-Up Sight for AR-15

Enhance your AR-15, M16, or M4 with the FAB Defense FXRBS Rear Back-Up Sight. Designed for extreme optical advantage, this durable sight is made from high-grade polymer and metal. It mounts easily on any 1913 Picatinny rail, offering versatility for both primary and backup use. The dual apertures feature a 3mm setting for longer eye relief and faster target acquisition, plus a 1.5mm setting for enhanced accuracy. Enjoy rapid spring-locked deployment without worrying about snagging, thanks to its low folded profile.