FAB Defense FBS Front Back-Up Sight — AR-15/M4, Black

Description

The FAB Defense FBS is a compact front back-up sight designed for AR-15/M4/M16 platforms. It offers a low folded profile and an ergonomic shroud to aid sight alignment. Deployment uses an instant spring-locked mechanism and elevation is adjustable without tools. Constructed of high-grade polymer and metal, the FBS is intended for reliable service on duty rigs, range setups, or field use.

Key Specifications

• Can be used as a primary or back-up sight.
• Designed with an ergonomic angel-wing-shaped front shroud to help center the image.
• Provides a low folded profile that resists snagging on gear or brush.
• Features an instant spring-locked deployment mechanism that will not slip, break, or deform.
• Offers tool-free, rapid elevation adjustments with positive detent locking.
• Mounts on any 1913 Picatinny rail.
• Constructed from high-grade polymer and metal.
• Fits AR-15 / M4 / M16 platforms.
• Style is Flip Up Back Up.
• Weight is listed as 0.16.

Compact, durable, and simple to operate, the FBS gives shooters a practical sighting option that blends unobtrusive carry with positive, repeatable deployment. Its combination of tool-free adjustment, rugged materials, and Picatinny compatibility makes it suited for shooters seeking a dependable front sight for range, duty, or field applications.