The NcStar AR-15 45 Degree Offset Flip-Up Rear Sight Black delivers quick, reliable iron sighting for AR-15 enthusiasts, combining offset practicality with durable, field-ready design. This rear sight mounts to receiver-height Weaver/MIL-STD 1913 rails, enabling seamless integration with existing optics and accessories, while the 45-degree offset configuration provides fast transitions to secondary sights without removing your primary optic. The A2 dual aperture system offers both large and small apertures and is fully adjustable for windage, featuring a large windage knob for precise zeroing and rapid drift adjustments in the field. When not in use, the sight folds flat to maintain a lower profile and remain compatible with the majority of scopes currently on the market, helping to preserve clear lines of sight and minimize snag hazards during breaches or transport. At a lightweight 2.6 oz., it adds minimal weight without sacrificing durability, making it an ideal upgrade for rifle setups that demand versatility, reliable backup iron sights, and adaptable performance in dynamic shooting scenarios.