Daniel Defense 16-inch Government Profile Barrel Features: Daniel Defense s 16 Government Profile Carbine-Length Cold Hammer Forged Barrels are made from start to finish in a state-of-the-art facility located in Black Creek GA. In keeping with a tradition of high quality components all cold hammer forged barrels feature a forged chamber and the highest quality exterior coating. These barrels will prove themselves to be more accurate and last longer than a barrel that has cut or button rifling. The Cold Hammer Forging of barrels is accomplished through intense hydraulic pressure applied at opposing angles by carbide steel hammers. During the hammering process a mandrel is inserted into the bore while the carbide steel hammers shape the barrel around the mandrel creating the chamber the lands and the grooves. In addition to the aforementioned benefits the Cold Hammer Forging process creates a defect free bore and the most consistent chamber possible. Includes factory installed low profile gas block. Danield Defense 16 Barrel Specifications: Manufacturer Daniel Defense Caliber 5.56mm NATO Barrel Length 16 Manuf. Process Cold Hammer Forged Twist Rate 1:7 Muzzle Thread 1/2A-28 TPI (Threads Per Inch) Material Chrome Moly Vanadium Outside Finish Mil-Spec Heavy Phosphate Inside Finish Chrome Gas System Mid-length Diameter At Gas Port .750a ^2 Barrel Extension A4 Profile Government Weight 1.78lbs Includes: Low Profile Gas Block