The BT20B Atlas Accuracy International Spigot Bottom Rail is the same rail found in the BT20, but consists of the bottom 1913 rail ONLY.

The ARCALOCK Clamp will bolt directly to any "NC" (No Clamp) style of Atlas Bipods (except the 5-H) using provided hardware.

The BT10 V8 Atlas Bipod mounts directly to any 1913 style Picatinny rail via a low profile two screw clamp assembly.

The BT10-LW17 V8 Atlas Bipod mounts directly to any 1913 style Picatinny rail via the included ADM-170-S lever.