When purchasing Criterion Barrels Inc or any other brand from eGoods365.com store, you can be sure that (a) you are purchasing from US based company with the most responsive and friendly customer service; (b) an authentic, not a counterfeit and not a refurbished product.

The barrels are chrome-lined and button rifled with 223 Wylde chambers and 1-8" twist. This design enhances accuracy potential for both .223 and 5.56 NATO ammunition. The chrome-lining process ensures uniformity throughout the bore, and hand-lapping smooths the lands and grooves. The gas ports are optimized for barrel length and chambering to ensure reliable cycling. Carbine, mid-length, and rifle gas systems are available. There are also 1/2"-28 tpi muzzle threads for standard comps and flash hiders, plus M4 feed ramps on barrel extension to aid in smooth, reliable feeding. Now featuring a dimple opposite the gas port, screw-on gas blocks do not shift during firing. The 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.