Ruger American Rifle Short Action Picatinny Aluminum Black Hard Coat Anodi. The MIL-STD Picatinny slot-and-rail spacing accepts Picatinny or Weaver scope rings. One-piece design is precision-machined from billet aluminum. The base is 6" long with a hardcoat anodized finish and includes (4) TORX mounting screws and a T-10 wrench. Specifications for Ruger 90671 American Rifle Short Action Picatinny Aluminum Black Hard Coat Anodi: Manufacturer: Ruger Finish: Black Hard Anodize Fabric/Material: Aluminum Gun Type: Rifle Length: 6 in Additional Features: 1 Piece Attachment Type: Screw