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The Cooper 57 is in steel black matte finish with a 20 moa built in. Screws are included. To measure the screw hole spacing, measure from the rear of the receiver and center to center of the holes. The measurements for the Cooper 57:
1st to 2nd hole - .500
1st to 3rd hole - 3.090
1st to 4th hole - 3.950
Length of mount - 5.188
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