This Precision Rail Scope Mount – 30 MOA is designed for distance shooting up to 1000 yards or for use with canted scope rings. The rail is engineered specifically to fit the Ruger Precision Rifle factory scope mount holes on the gun’s receiver and includes mounting screws. One-piece design is precision-machined from billet aluminum. MIL-STD Picatinny slot-and-rail spacing accepts Picatinny or Weaver scope rings. Rail is 7.8″ long with a hardcoat anodized finish. The scope mount includes (4) mounting screws and a T-15 Torx wrench. Genuine Ruger Factory Accessory.