The NCStar AR-15 Detachable Rear Sight is a solid and dependable back-up fixed A2 rear sight, the NCStar MARDRS does not take up much of your valuable Picatinny rail space. You can have a back-up iron sight ready to go at a moment's notice and have space for a red-dot/reflex/holographic optic on your AR-15 upper receiver.
The MARDRS will fit virtually all AR-15, M4, and M16 flattop Picatinny rail upper receivers
A2 rear sight assembly with large and small rear aperture
The A2 rear sight is fully adjustable for elevation and windage with knurled click adjustable controls
Large steel thumb nut and steel rail clamp for positive and secure attachment to your upper receiver
Precision made A2 rear sight
The mount and rear sight is made from high quality aluminum and steel