Description
CMMG Barrel and BCG Kit for 5.7 x 28mm builds an AR pistol or SBR using CMMG’s Radial Delayed Blowback operating system. It combines an 8 in 5.7 x 28mm barrel with a bolt and is designed to assemble into a Mk4/mil-spec AR15 upper. It also works with a CMMG Mk57 lower receiver, or a Mk4/AR15 mil-spec lower receiver when using CMMG 5.7 AR Conversion Magazines. The setup is described as providing last round bolt hold open.
Key details
- 8 in 5.7 x 28mm barrel paired with bolt components
- Radial Delayed Blowback operating system
- No sights
- Designed for Mk4/mil-spec AR15 upper assembly
Specifications
| Part Type | Barrel and BCG Kit |
|---|---|
| Caliber | 5.7 x 28 mm |
| Barrel Length | 8 in |
| Action | Radial Delayed Blowback |
| Sights | No |
