White Label Armory AR15 Barrel Features The White Label Armory AR15 Barrel is chambered in 5.56 NATO and cut to 13.7 with a 1:7 twist rate a fast twist that stabilizes heavier 5.56 projectiles commonly used for longer-range and match-grade shooting. Its midlength gas system positions the gas port further forward on the barrel than a carbine-length system which softens the recoil impulse and smooths the cycling of the action. The government profile contour keeps the barrel s exterior dimensions consistent with mil-spec standards ensuring compatibility with standard AR-15 handguards gas blocks and front sight bases. This combination of twist rate and gas system length makes the barrel well suited to a general-purpose carbine build intended for both close and mid-range use. Builders assembling a complete upper around this barrel benefit from its standard government profile which simplifies parts selection since most aftermarket AR-15 components are designed around this exact dimension. The midlength gas system also reduces the mechanical stress placed on the bolt carrier group compared to shorter carbine-length systems which can translate into a longer service life for the rest of the upper assembly. At 13.7 the barrel sits in a popular length range for AR-15 pistols and short-barreled configurations once paired with the appropriate muzzle device and gas block. This White Label Armory barrel gives builders a dependable foundation for a 5.56 NATO upper available for sale at GrabAGun. White Label Armory AR15 Barrel Specifications Manufacturer: White Label Armory Model: AR15 Barrel Caliber: 5.56 NATO Barrel Length: 13.7 Barrel Type: Midlength Twist Rate: 1:7 Barrel Description: Government Profile Available At: GrabAGun