DEMO Precision Reflex Gen 3 Carbine Delta Forearm SPR Straight Top Rail Carbine Length Black. The overall length of rail is 11.75in. Rail comes with all the screws and bar nuts to attach rail to the upper. This forearm attaches to the receiver with 3 clamp screws and then there are 2 screws that pass through the forearm and screw into a bar nut placed on the inside. Requires the top forearm rail to be removed. Specifications for Precision Reflex Carbine Delta Forearms: Manufacturer: Precision Reflex Color: FDE Finish: FDE Cerakote Fabric/Material: Carbon Fiber/Aluminum/Steel Gun Make: AR Platform Gun Type: Rifle Handguard Type: Free-Float Handguard Style: Hybrid Rail Gun Rail: Full Top Rail Gas System Length: Carbine Length Mount Type: Rail Model Generation: 3 Quantity: 1 Package Contents: Precision Reflex Carbine Delta Forearms Precision Reflex 05-071-03: Gen 3 Carbine Delta Forearm SPR Straight Top Rail Carbine Length Black