CMMG Barrel Sub-Assm, 8″ MT 4140CM SBN, 40 S&W

Barrel Sub-Assm, 8″ MT 4140CM SBN, 40 S&W

Complete your AR pistol build with an 8″ 40 S&W Radial Delayed Blowback™ 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.

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