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The BT17 - 4" 1913 Picatinny Rail will accommodate hole patterns with a center to center spacing of 2.2" - 3.5" with a FLAT back to accommodate flat surfaces. Machined to Picatinny rail standards from 6061-T6 aluminum with Mil-Spec Type III Class 2 finish. A standard sling stud and sling stud spacer can be used as one fastener or two button head machine screws can be used. Hardware not included.