This .223 Wylde chambered 18 inch barrel is machined from 416R Stainless Steel with a bead blasted finish. Ballistic Advantage Premium Series Barrels feature a Nickel Boron Coated Extended M4 Feed Ramp Extension. Featuring functionally aggressive flutes and crisp, clean lines, BA Fluted barrels deliver the perfect balance of weight and rigidity. Utilizing six and eight flute designs thry have achieved weight reduction up to and exceeding 16 oz Confidently lighten your kit without sacrificing an ounce of accuracy.