Precision Reflex Gen 3 15in Free Float Forearm No Holes No Rails Carbon Fiber Natural. Total length of the forearm is 15.5in. 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. Specifications for Precision Reflex Free Float Forearm w/ No Rail No Holes: Manufacturer: Precision Reflex Color: Carbon Finish: Natural Fabric/Material: Carbon Fiber/Aluminum/Steel Gun Make: AR Platform Gun Type: Rifle Handguard Length: 15 in Handguard Type: Free-Float Gun Rail: Standard Model Generation: 3 Quantity: 1 Package Contents: Precision Reflex Free Float Forearm w/ No Rail No Holes Precision Reflex 05-073-15T: Gen 3 15in Free Float Forearm No Holes No Rails Carbon Fiber Natural