| Caliber | 5.7x28mm |
| Operating System | Radial Delayed Blowback |
| Barrel Length | 8 |
| Barrel Twist | 1:9 |
| Barrel Contour | MT |
| Barrel Material | 4140CM, SBN |
| Barrel Twist | 1:9 |
| Muzzle Thread | 1/2 x 28 |
| Gas Port Location | N/A |
AR Parts Notice - State/local restrictions may apply in CT, DC, IL, MA, NJ, NY, or WA. Customers must review our Shipping Policy prior to ordering.
Barrel Sub-Assm, 8" MT 4140CM SBN, 5.7x28mm
Complete your AR pistol build with an 8" 5.7x28mm 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.
All CMMG products are backed by our Lifetime Quality Guarantee. Learn More.