F.A.B. Defense's FBS is a rail-mounted, flip-open backup front sight that is fully adjustable.

FBS is an advanced, low-profile, durable, auxiliary front sight. It can be used with any rear sight, but has been designed to provide an extreme optical advantage when paired with the FAB Defense RBS Rear Back-up Sight. Sight pin elevation is easily and quickly adjusted without tools.

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.

Features and Benefits:

• 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

Compatibility:

• All 1913 Picatinny rails
• The FBS should never be mounted on a railed gas block

SKU: FBSBLK