The FN AR-15 5.56 NATO 1:7 CHF CL Barrel is engineered to give shooters superior accuracy and long-lasting field use with their favorite AR-15 rifle. This barrel is built for a .750” diameter gas block and features 1/2x28 threads, so you can easily add muzzle accessories such as brakes, suppressors, and flash hiders to your favorite rifle. Featuring proprietary Chrome Moly Vanadium (CMV) steel construction, this barrel is hammer-forged for superior strength and long-lasting durability to ensure unparalleled longevity in any shooting application.