The BT17 - 4" 1913 Rail will accommodate hole patterns with a center to center spacing of 2.2 – 3.5" with a FLAT back to accommodate flat surfaces.
A standard sling stud and sling stud spacer or two button head machine screws can be used as a fastener. NO HARDWARE IS INCLUDED. See BT1517 to attach this rail to the forearm of standard rifle stocks.
Machined to Picatinny rail standards from 6061-T6 aluminum with Mil-Spec Type III Class 2 finish. Available in black only.