The Daniel Defense S2W Heavy Barrel delivers exceptional accuracy and durability with its 18-inch length and 1:7 twist rate optimized for 5.56/.223 ammunition.Daniel Defense S2W Heavy Barrel Profile18" barrel length for enhanced velocity and accuracy1:7 twist rate for stabilizing heavier projectilesRifle-length gas system for smooth cyclingMatte black finish for durability and corrosion resistancePremium construction meets Daniel Defense quality standardsIdeal for precision shooting competitive use and builds requiring maximum accuracy potential with consistent performance across various ammunition weights.