Salmon River Solutions Ruger American Combo Rail Black. Ruger rails include two longer 10-32 bolts and two 10-32 hex nuts that are product/gun specific. This combo rail will also include one shorter 10-32 with one tee nut to install for the fastener hole that is in the picatinny portion of the rail. Specifications for Salmon River Solutions Ruger American Combo Rail: Manufacturer: Salmon River Solutions Color: Black Finish: Anodized Fabric/Material: 7075 Aluminum Hand: Ambidextrous Gun Type: Rifle Gun Make: Ruger Gun Model: Ruger American Rifle Length: 9.5 in Weight: 3.5 oz Features of Salmon River Solutions Ruger American Combo Rail Easy install with a hand drill. Integrated sling stud hole Integrated QD cup for "tactical" attachment Package Contents: Salmon River Solutions Ruger American Combo Rail Salmon River Solutions 1157: Ruger American Combo Rail Black