Bsf Barrels AR-15 ARC Barrel Features The Bsf Barrels AR-15 ARC Barrel begins as a turned down 416R stainless steel match barrel which is then jacketed in a roll-wrapped carbon fiber sleeve loaded under tension rather than simply wrapped around the steel. This tensioned jacketing method avoids the heat trapping and delamination problems common to conventional carbon fiber wraps so the barrel holds up to repeated strings of fire. The carbon fiber is engineered to expand at the same rate as the 416R stainless steel beneath it which means the two materials move together as the barrel heats up rather than working against each other. Machined slots in the jacket let air move around the barrel to vent heat quickly keeping the rifling straighter even as the barrel warms during extended shooting sessions. Built with a 1:8 inch twist rate over a 14.5 inch button rifled bore this barrel suits the heavier bullet weights common to .338 ARC for AR style rifles. Because the carbon fiber jacket is under tension the barrel retains its stiffness and strength while weighing considerably less than a comparable solid steel barrel helping keep a short barreled AR build fast handling. A 5/8x24 thread pattern on the muzzle end accepts standard compensators flash hiders and suppressor mounts for AR platform rifles. This 14.5 inch stainless and carbon fiber barrel is available for sale at GrabAGun for shooters building a lightweight heat tolerant .338 ARC rifle for precision or duty use. BSF Barrels AR-15 ARC Barrel Specifications Manufacturer: BSF Barrels Model: AR-15 ARC Barrel Type: Rifle Barrels Caliber: .338 ARC Gun Platform: AR Style Action: Semi-Auto Barrel Finish: Carbon Fiber Barrel Material: Stainless Steel Twist: 1:8 Diameter: .875 Grooves: 6 Thread Pattern: 5/8x24 Barrel Description: Button Rifled Barrel Length: 14.5 Available At: GrabAGun