F.A.B Defense F.A.B Defense FBS Folding Back-Up Sights

FBS is readily mounted on any 1913 Picatinny rail, making it ideal for use on M4 / AR-15 / M-16 platforms and on the FAB Defense® KPOS.

Advantages:

Can be used as a primary or back-up sight

Ergonomic angel-wing-shaped front shroud helps center the image with any rear sight, but when used with a matching FAB Defense® RBS Rear Back-up Sight, it creates a precise optical tunnel that ensures more accurate aiming and faster target acquisition

Low folded profile is smooth and inconspicuous, and will not snag on gear, webbing, or brush

Instant spring-locked deployment mechanism will not slip, break or deform

No tools needed for easy, rapid elevation adjustments, with positive detent locking

Made of extremely durable high-grade polymer and metal