The 16.1” 5.7x28mm Barrel and BCG Kit is just the thing for building a carbine length AR in 5.7x28mm using CMMG’s patented Radial Delayed Blowback operating system. Unlike typical direct blowback systems, Radial Delayed Blowback not only reduces the weight in your BCG but it results in less felt recoil than a straight blowback system without sacrificing key features like last round bolt hold open. CMMG’s 5.7x28mm Barrel and Bolt Kits are designed to be assembled into a Mk4/mil-spec AR15 upper and work with either a CMMG Mk57 lower receiver or Mk4/AR15 mil-spec lower receiver (when using CMMG 5.7 AR Conversion Magazines).
All CMMG products come with their Lifetime Quality Guarantee.
| CALIBER | 5.7X28MM |
| OPERATING SYSTEM | RADIAL DELAYED BLOWBACK |
| BARREL LENGTH | 16.1 |
| 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 |
- Manufacturer Part Number:
- 57D0476
- Sub Category:
- Barrel and BGC Kits
- Cartridge:
- 5.7x28mm
- Length:
- 16.1"
- Gas System Length:
- Blowback
- Gas Block Diameter:
- Blowback Gas System - No Gas Block
- Profile:
- MT
- Barrel Finish:
- Salt Bath Nitride
- Twist Rate:
- 1:9
- Muzzle Threads:
- 1/2x28
