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Barrels that are chrome-lined and button rifled have an enhanced accuracy potential with both 223 and 5.56 NATO ammunition thanks to their 223 Wylde chambers and 1-8" twist. The unique chrome-lining process maintains consistency throughout the bore and smooth, consistent lands and grooves, thanks to hand-lapping. These barrels have optimized gas ports that are designed to ensure reliable cycling and are available for carbine, mid-length, and rifle gas systems. They also have 1/2"-28 tpi muzzle threads for standard comps and flash hiders, plus M4 feed ramps on barrel extension for reliable feeding. Now, these barrels feature a dimple opposite the gas port to prevent screw-on gas blocks from shifting during firing. Hybrid contour barrels are reduced and tapered under the handguard to save weight, while HBAR contour barrels have .870" diameter under the handguard for rigidity and extra heat absorption.