Precision Reflex .308 AR10 Round Intermediate Forearm Rail 5.5 inch Black. 5 inch intermediate top rail for 308 Armalite round intermediate forearms. 5.5 inch rail for 308 Armalite round forearms can be used in top or bottom positions. Rail is constructed of T6 hard coat anodized aluminum with steel Bar nut and 3 #10-32 flat head screws. Specifications for Precision Reflex .308 AR10 Round Intermediate Forearm Rail: Manufacturer: Precision Reflex Fabric/Material: Aluminum Gun Rail: Round Cant: 0 MOA Gun Make: AR Platform Gun Model: AR-10 Length: 5.5 in Quantity: 1 Package Contents: Precision Reflex .308 AR10 Round Intermediate Forearm Rail Precision Reflex 03-070-55A: .308 AR10 Round Intermediate Forearm Rail 5.5 inch Black