During extended strings of fire, your AR-15 will get hot fast, and that heat transfers easily to an aluminum handguard. Depending on how hot your barrel is, a solid afternoon at the range can make your gun too hot to touch! The Battle Arms Development Carbon Fiber Handguard is built to resolve this issues. Thanks to the heat-dissipation qualities of carbon fiber, the Battle Arms Development Carbon Fiber Handguard efficiently and effectively combats heat buildup, ensuring that shooters can stay on the range without worrying about hot handguard or gloves. Each Battle Arms Development Carbon Fiber Handguard is made from 35-50 carbon fiber and features a 7075 aluminum barrel nut. The added benefit of the carbon-fiber construction on the handguard is its light weight, and the whole, 10-inch unit weighs in at just 5.2 ounces. The inside diameter of the handguard is 1.786 inches, and the outside diameter is 1.932 inches.