Precision Reflex AR15 SPR Top Rail Round Forearms Gen 3 15in Flat Dark Earth. The 8.5'' forearm rail need to be removed to install top rail. This creates a rigid platform ideal for mounting accessories.This rail is constructed of hard coat black anodized T6 aluminum. Rail connects to rifle receiver with 3 cross bolts and the front of the rail connects to the forearms top rail using to screws. Rail is 19.5'' in length with an add elevation of .450''. Specifications for Precision Reflex AR15 SPR Top Rail Round Forearms: Manufacturer: Precision Reflex Color: Flat Dark Earth Fabric/Material: Aluminum Cant: 0 MOA Gun Make: AR Platform Condition: New Package Contents: Precision Reflex AR15 SPR Top Rail Round Forearms Precision Reflex 05-SPR-R15-DE: AR15 SPR Top Rail Round Forearms Gen 3 15in Flat Dark Earth