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The AR-15 Rear Flip-Up Sight is an A2 style dual aperture sight designed for modern sporting rifles. This rear sight is designed to flip up when needed or lock down when you are using your optical sight. Now you can have the best of both worlds with the capability to transition to your backup iron sights with the push of a button. With this sight system installed there will never be a chance for your optical sight to fail leaving your rifle useless in the field.