| 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 |
Due to high demand, some of our parts and accessories may be on backorder and have an extended lead time. Items currently on backorder can still be purchased. Expected to ship in 4 to 6 weeks.
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.