BSF Barrels AR-15 .300 AAC Blackout Threaded Barrel 16in Pistol Length 1-7 Twist 5/8x24 Gray. We use this jacketing method rather than wrapping the barrel in carbon fiber because this method of wrapping has been proven to trap heat and cause delamination. The carbon fiber we use is specially designed to move at the same expansion rate as 416R stainless steel. We machine slots into the carbon fiber allowing air to move around the barrel and vent heat quicker without any delamination issues. Using the Carbon Fiber this way keeps the rifling straighter the warmer the barrel gets because it's under tension. This allows us to maintain superior stiffness and strength while keeping the barrel extremely lightweight. Specifications for BSF Barrels AR-15 .300 AAC Blackout Threaded Barrel: Manufacturer: BSF Barrels Color: Gray Finish: Carbon Fiber Fabric/Material: Carbon Fiber Caliber: .300 AAC Blackout Barrel Profile: Contour Gas System Length: Pistol Length Threads per Inch: 5/8x24 Barrel Material: 416R Stainless Steel Flutes: No Gun Make: AR Platform Gun Model: AR-15 Package Contents: BSF Barrels AR-15 .300 AAC Blackout Threaded Barrel What firearm models does the manufacturer say BSF Barrels AR-15 .300 AAC Blackout Threaded Barrel is compatible with? The manufacturer suggests that BSF Barrels AR-15 .300 AAC Blackout Threaded Barrel is compatible with AR-15BSF Barrels SF3IYT0096: AR-15 .300 AAC Blackout Threaded Barrel 16in Pistol Length 1-7 Twist 5/8x24 Gray