Barrel, 40 S&W, 8", MT

Complete your AR pistol build with an 840 S&W 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.