AccuShot BT10 Atlas Bipod Standard Two Screw 1913 Rail Clamp Material: T6061 Aluminum BT10-Mounts Directly to any 1913 Style Picatinny Rail via a Low Profile two Screw Clamp Assembly Height Range Approximately 4.75 - 9.0" Weight 11.0 Oz. Made in the U.S.A.