16" M4 AR-15 5.56 .223 Carbine Barrel + Free KAK Flash Can Barrel Info:This 5.56 chambered 16" M4 Profile Barrel is machined from 4150 Chrome Moly Vanadium steel with a QPQ Corrosion Resistant Finish and QPQ coated M4 feed ramp extension. Quench Polish Quench (QPQ) is a specialized type of nitrocarburizing case hardening that increases corrosion resistance. It is sometimes known by the brand name of Tufftride, Tenifer Black Nitride or Melonite. QPQ is a huge improvement over Chrome Lined barrels. Unlike chrome lining, where the chrome is built up on the surface, QPQ converts the surface without the risk of dimensional build up. Length - 16" Material - 4150 Chrome Moly Vanadium 11-Degree Target Crown - Further improve accuracy Profile - M4 Finish - QPQ Corrosion Resistant Gas System Length - Carbine Gas Block Journal - .750" Gas Block Journal Twist Rate - 1/7 Twist Muzzle - 1/2x28 Threaded Weight - 28oz Muzzle Device Info:In need of a linear compensator to direct blast, noise and gases down range? The Slim Line flash can from KAK Industries is a great option. This particular model is perfect for 5.56, .223 or 22LR pistol, rifle or SBR builds, and it can be used on .22LR rifles or rimfire caliber rifles shooting 9mm or smaller. Following the KX5 diameter, this flash can will fit under most handguards and rails. Keep in mind that it does not use a crush washer so it should be torqued directly against the barrel shoulder. Its specs are as follows: 1.2" diameter 3.25" long 6061 aluminum Black hard anodized finish 3.5 oz. 3/4" wrench flats Threaded 1/2x28 for 9mm or smaller SKU: KM55616M4-KAKCAN UPC: 860006522037