The NcSTAR AR-15 Flip up Rear Sight will fit virtually all AR-15 M4 and M16 flattop Picatinny rail upper receivers. A2 rear sight is fully adjustable for windage with knurled click adjustable controls. Large steel thumb nut and precise rail clamp for positive and secure attachment to your upper receiver. It is made of hard anodized aluminum.
Reviewed by 1 customers
We use this as a back up sight, in case your scope gets bumped and does not hold a zero, just quick release scope and flip up sights. In business.