The Magpul Back Up Sight (MBUS) was designed as a low-cost, folding back up iron sight. Molded from durable color polymers the MBUS fits picatinny rail forends and will fold down out of the way when not in use.
NOTE: Due to the heat that is generated at the gas block of the AR-15 it is not recommended that polymer sights be placed on railed gas blocks.
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