Atlas Bipods 1913 Rail set 3 option for BT19 allows BT10 and BT10LW17 mounting Black. These rails are made from 6061T6 Aluminum with a type II hard coat anodize and come complete with fasteners they are proudly made in specialized factories and cost 54.95. Specifications for Atlas Bipods 1913 Rail set 3 option for BT19 allows BT10 and BT10LW17 mounting: Manufacturer: Atlas Bipods Country of Origin: USA Package Contents: Atlas Bipods 1913 Rail set 3 option for BT19 allows BT10 and BT10LW17 mounting Atlas Bipods BT20 1913 Rail set 3 option for BT19 allows BT10 and BT10LW17 mounting Black