Precision Reflex Delta Replacement Bottom Rail Forearms 3in Black. 5 Inch Replacement Forearm Rail with stainless steel lugs. Rail has 1913 rail configuration. Rails have a 2'' radius contour cut on bottom side to mate up with 2'' tube. Rails are constructed of T6 6061 hard coated black anodized aluminum. The rail comes with 4 mounting screws and 2 bar nut for installin Specifications for Precision Reflex Delta Replacement Bottom Rail Forearms: Manufacturer: Precision Reflex Color: Black Fabric/Material: Aluminum Cant: 0 MOA Gun Make: AR Platform Package Contents: Precision Reflex Delta Replacement Bottom Rail Forearms Precision Reflex 05-071-3B: Delta Replacement Bottom Rail Forearms 3in Black