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Barrels with a 223 Wylde chamber and 1-8" twist are chrome-lined and button rifled to improve accuracy with .223 and 5.56 NATO ammunition. The chrome-lining process ensures consistency throughout the bore, while hand-lapping produces smooth lands and grooves. Gas ports are optimized for barrel length and chambering to improve cycling and are available for carbine, mid-length, and rifle gas systems. The barrels also come with M4 feed ramps and 1/2"-28 tpi muzzle threads for standard comps and flash hiders. The new feature is a dimple on the opposite side of the gas port to ensure the screw-on gas blocks do not shift during firing. Hybrid contour barrels have a reduced and tapered contour under the handguard to save weight, while HBAR contour barrels feature .870" diameter under the handguard for rigidity and extra heat absorption.