The Atlas BT 1913 Rail adaptors will accommodate either new or existing hole patterns 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

There are 4 variants. It is suggested to use the Atlas 1517 Mounting Kit.

BT15
3.35" 1913 Rail will accommodate hole patterns with a center to center spacing of 1.76 – 2.78" and a relieved back to accommodate curved surfaces.

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.

BT34
2.05" 1913 Rail has a center to center spacing of 1.6". Two machine screws can be used not included, (see BT1517) to attach this rail to the forearm of standard rifle stocks. It can also be attached to a horizontal surface on the Butt section to attach our Precision Rail Monopods.

BT49
2.05" 1913 Adjustable Rail has a center-to-center spacing of 1.2 - 1.6". Two machine screws can be used (not 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. The BT49 can also be attached to a horizontal surface on the Butt section to attach our Precision Rail Monopods.