Precision Reflex Armalite Receivers .308 SPR Delta Top Tactical Rail System 15in Black. This rail will also give you the SPR look in a 308 package. This rail is constructed of T6 6061 hard coated black anodized aluminum. The rail has a full 1913 rail across the top. Rails come with mounting screws for attachment to forearm rail. Rail is 22in in length. This Rail is designed to work with PRi's 14inDPMS Delta forearms. Mounting this rail requires the 8.5in rail to be removed from forearm. All mounting hard ware comes with rail. Specifications for Precision Reflex .308 SPR Armalite Delta Top Tactical Rail System: Manufacturer: Precision Reflex Color: Black Finish: Hard Coat Anodized Fabric/Material: T6 6061 Aluminum Gun Rail: Full Top Rail Cant: 0 MOA Gun Make: AR Platform Gun Model: AR-10 Length: 15 in Width: 1.325 in Height: 0.475 in Weight: 12.7 oz Quantity: 1 Package Contents: Precision Reflex .308 SPR Armalite Delta Top Tactical Rail System Precision Reflex 03-071-SPR-15A: Armalite Receivers .308 SPR Delta Top Tactical Rail System 15in Black