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.

• AR-15/M16 Flip Up Rear Sight
• Designed to be Mounted on Top of Standard AR-15 style rifles with Picatinny Rails- Adjustable for Windage
• Constructed of Hard anodized Aluminum
• Best priced sight available for quick transition from electronics to irons.
• This sight is suitable for duty or combat use in virtually any environment.