The BT47-LW17 PSR (Precision Sniper Rifle) Atlas Bipod mounts directly to any 1913 style Picatinny rail via the included ADM-170-S lever. It is comprised of 6061-T6 aluminum, except the strengthened inner legs which are made from 7075-T6 aluminum that are Mil-Spec Type III hard coat anodized and have heat treated, stainless steel components. The PSR series of Atlas Bipods were developed for the SOCOM PSR (Precision Sniper Rifle) Weapons System. Buy with confidence from a B & T (Atlas Bipod) authorized dealer. Specifications: Bonus Item: American Flag Black PVC Hook & Loop Patch Included! Height Range: 7–13" Preloaded Pan: 30 degrees Preloaded Cant: 30 degrees Position Button 0.5" diameter Fore and Aft pivot limiting Bosses 5 leg positions: 0, 45, 90, 135 & 180 degrees Non-Rotating Legs: outer leg does not rotate around inner leg Larger, stronger inner legs Weight: 15.13 ounces approx. Footprint: 10-14.5" Designed, Engineered, Machined & Assembled in America. Footprint: 10-14.5"