Commonly Purchased with Barrel and BCG Kit, 8" 4140CM, SBN, 5.7x28mm
Barrel and Collar Kit, 9" MC, 22LR
Starting at
$199.95
Barrel and Collar Kit, 4.5" MT 4140CM, 22LR
Starting at
$174.95
22LR AR Conversion Kit, Mk57, w/3 Magazines, 25rd
Starting at
$229.95
Mil-Spec Trigger Kit, AR15
Starting at
$34.95
Buffer Assembly, H3
Starting at
$49.95
Magpul PMAG 30 AR/M4 GEN M3 Window, 5.56
Starting at
$17.95
Magazine, 5.7 AR Conversion, Gen II, 32rd
Starting at
$29.95
Barrel and BCG Kit, 8" 4140CM, SBN, 5.7x28mm
The 8" 5.7x28mm Barrel and BCG Kit is perfect for building an AR pistol or SBR 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 and still provides essential 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 NFA rules apply** See linked CMMG Resource article for more information.
All CMMG products come with our Lifetime Quality Guarantee.
Specifications
| Caliber | 5.7x28mm |
| Weight | 2.5 lbs |