Ballistic Advantage Premium, Barrel, 223WYlDE, 18, 1:8, SPR Rifle Barrel With Ops 12 Profile BABL223021P This .223 Wylde chambered 18 inch barrel is machined from 416 Stainless Steel with a bead blasted finish. Our Premium Series Barrels feature a Nickel Boron Coated Extended M4 Feed Ramp Extension. This barrel features a longer .750" profile dimension necessary for proper installation of the OPS Inc 12th model collar and suppressor.