Precision Reflex .308 AR10 Armalite Forearm Tactical Rail 8.5 inch Black. 5 inch Rifle to 15" top rail for 308 Armalite round forearms. This rail can be used in top or bottom positions. Rail is constructed of T6 hard coat anodized aluminum with steel Bar nut and 4 #10-32 flat head screws. Specifications for Precision Reflex .308 AR10 Armalite Forearm Tactical Rail: Manufacturer: Precision Reflex Fabric/Material: Aluminum Cant: 0 MOA Gun Make: AR Platform Quantity: 1 Package Contents: Precision Reflex .308 AR10 Armalite Forearm Tactical Rail Precision Reflex 03-070-85A: .308 AR10 Armalite Forearm Tactical Rail 8.5 inch Black