Blackhawk AR-15 Folding Rear Back Up Iron Sight Bla
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This folding rear back up iron sight is optimized for the AR platform and compatible with MIL-spec height front AR sights. Features a single hybrid aperture for simplicity and locks into stowed position with pushbutton-actuated spring deployment. It has an aluminum sight blade/aperture and polymer base for optimal strength-to-weight ratio. Made in the USA.