MUDCAT OUTDOORS Rear & Front Flip Up Folding Sight Set Tactical Back-Up Sights (Black) Tactical Low Profile, Polymer, Flip up Front & Rear Sights, Picatinny Rail Mount 223, 5.56. Precision made back up flip-up front and rear sight set. Color: Black Fit virtually all Picatinny rails; for same plane rail applications Front and Rear Sights creates a precise optical tunnel that ensures more accurate aiming and faster target acquisition Instant spring-locked deployment mechanism will not slip, break or deform Made of extremely durable high-grade polymer and metal