The Accu-Shot 1913 Picatinny Rail 2.05" has a center to center spacing of 1.2" - 1.6". Two button head machine screws can be used (BT1517, not included) to attach this rail to the forearm of standard rifle stocks. The BT49 can also be attached to a horizontal surface on the butt section to attach the Accu-Shot Precision Rail Monopod.