The FAB Defense FXFBS Front Back-Up Sight for AR-15, M16, and M4 delivers a low folded profile with spring-locked deployment, offering a reliable flip-up front and back-up sighting solution that blends polymer and metal construction in a durable black finish. Designed for AR platform rifles, this front flip sight pairs seamlessly with the back-up sight to deliver fast, repeatable aiming while keeping a compact silhouette when folded, reducing snag potential and maintaining optimal field of view. The combination of high-strength polymer and metal components provides rugged performance in demanding environments, from patrol duties to competitive shooting, ensuring the sight remains sturdy under recoil and exposure to the elements. Precision-armed shooters will appreciate the intuitive deployment mechanism that enables rapid transition from folded to deployed without delaying follow-up shots, making it a practical upgrade for accuracy-focused builds that demand reliable co-witness or independent aiming solutions. Whether upgrading an existing AR-15 configuration or assembling a new duty or recreational rifle, the FXFBS Front Back-Up Sight from F.A.B. Defense offers a versatile, durable, and unobtrusive sighting option designed to enhance precision and versatility.