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These barrels are designed to improve accuracy with both .223 and 5.56 NATO ammunition. They feature a chrome-lined, button rifled construction with a 223 Wylde chamber and 1-8" twist rate. The chrome-lining process is unique, providing a consistent bore, while the hand-lapping ensures smooth and consistent lands and grooves. For added reliability, the gas ports are optimized for the barrel length and chambering. The barrels are available with carbine, mid-length, and rifle gas systems. They also feature 1/2"-28 tpi muzzle threads for standard comps and flash hiders, plus M4 feed ramps on barrel extension for smooth feeding. A gas block dimple is included opposite to the gas port to prevent gas blocks from shifting during firing. Hybrid contour barrels are tapered underneath the handguard to save weight, while HBAR contour barrels have a .870" diameter to ensure rigidness and extra heat absorption.