Precision Reflex Round Free Float Forearm Gen 3 14in Carbon Fiber Black. 5in rail on top and 3- 3in rails at 36 and 9 O'clock positions. The forearm is constructed of wrapped carbon fiber with an aluminum barrel nut and collar. Total length of the forearm is 14.5in and weights 16.6oz. including barrel nut. The clearance from the center line of the barrel to the underside of the forearm is .78in. The inner diameter of the barrel nut is 1.075in Custom barrel nuts with larger ID for larger diameter barrels can be made. Forearm wrench not included. Specifications for Precision Reflex Round Free Float Forearm: Manufacturer: Precision Reflex Color: Black Finish: Cerakote Fabric/Material: Carbon Fiber/Aluminum/Steel Gun Make: AR Platform Gun Type: Rifle Handguard Length: 14 in Handguard Type: Free-Float Handguard Style: Round Rail Gun Rail: Standard Condition: New Mount Type: Rail Model Generation: 3 Quantity: 1 Package Contents: Precision Reflex Round Free Float Forearm Precision Reflex 05-073-14B: Round Free Float Forearm Gen 3 14in Carbon Fiber Black