PSR Atlas Bipod: Tall No ClampThe BT47 NC PSR (Precision Sniper Rifle) Atlas Bipod "No Clamp" model has a two hole pattern of 1. 100 with the holes being 10 32 threads. It requires any 17S size lever style mount to include the ADM 170 S, ARMS 17S, TRAMP from Badger Ordnance, LT271 or any ARCA dovetail mount with the same hole pattern. The BT47 NC will also mount directly to our BT19 AI Spigot or BT70 M LOK Adapter. It is comprised of 6061 T6 aluminum, except the strengthened inner