Every weapon with an optical sight should have an auxiliary sighting system. If your optic depends on batteries, auxiliary sights are an absolute necessity. Features: Designed for M4, M16 and AR-15 rifles, the KPOS system, and other weapons with same-plane mounting locations and similar sight height. Finger-adjustable for elevation. Low-profile, lightweight design. May be used as primary or secondary sights. Ambidextrous deployment and control. High-grade polymer and metal construction. Spring-based locking mechanism will not break or deform. Mounts to MIL-STD-1913 Picatinny rails. Front sight height designed for mounting to handguard on same plane as rear sight, not to AR-15 gas blocks. Front sight weight: .88 oz. Carries Manufacturer Lifetime Replacement Guarantee!