The new BT15 3.35" 1913 Rail will accommodate hole patterns with a center to center spacing of 1.76 – 2.78" with a relieved base to accommodate curved surfaces. A standard sling stud and Sling Stud spacer can be used as one fastener or two Button head machine screws can be used, NO HARDWARE IS INCLUDED (see BT1517
) to attach this rail to the forearm of standard rifle stocks. The BT15 can also be attached to a horizontal surface on the Butt section to attach our BT12 or BT13 Precision Rail Monopods. The BT15 also has a flush cup for that style of sling swivels.