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This AR-15 Back-Up Rear Sight should fit all AR15, M4 and M16 flattop picatinny rail upper receivers. It is fully adjustable for elevation and windage with knurled click adjustable controls. We also have M-16/AR-15 Flip Up Rear Sight if you are looking for another type of AR15 Backup Iron Sight.
If you need a tool to sight your AR-15 Rifles, we have AR15 front sight adjustment tools for sale.