Barrel, 5.7x28mm, 8", MT

Complete your AR pistol build with an 8" 5.7x28mm Radial Delayed Blowback(TM) barrel. Made from 4140CM, each barrel has a salt bath nitride finish for maximum durability and corossion resistance.Bolt Carrier Group Compatibility: Radial Delayed Blowback barrels feature a unique barrel extension and require the use of the matching caliber RDB bolt carrier group.**All NFA rules apply** See linked CMMG Resource article for more information.All CMMG products are backed by our Lifetime Quality Guarantee. Learn More.