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For a durable and compact flip-up rear A2 iron sight the NcSTAR MARFLR is the AR-15 back-up rear iron sight that youre looking for.

Features:

- Precision made flip-up A2 rear sight. The MARFLR will fit virtually all AR-15, M4, and M16 flattop Picatinny rail upper receivers.
- A2 rear sight assembly with large and small rear aperture. A2 rear sight is fully adjustable for windage with knurled click adjustable controls.
- Large steel thumb nut and precise rail clamp for positive & secure attachment to your upper receiver.
- With the MARFLR flip-up sight folded down, its 1 7/8 Length X 11/16 Height (mount height) & 1 1/16 Height (A2 sight base when folded)