Flip Up Rear Sight with multiple apertures

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• multi-aperture design. 4 aperture sizes in one
• knurled aperture wheel can be turned easily in both directions
• folds down and stays flat when not in use
• locks firmly in place
• with knurled thumb nut. INSTALLS IN SECONDS  
• easy to turn knurled windage adjustment wheel
• fits onto picatinny rails on flat top.
• made OF HEAVY DUTY aircraft quality aluminum ALLOY  
• MATTE ANODIZED black finish
• includes allen head wrench for mounting screw
• WEIGHT: 2 OZ.