The 16.1" 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).
| Item # | RSR|CMMG57D0476 |
|---|
| Available Colors | Black |
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Most in-stock items ship within 1–2 business days via UPS or USPS. Free standard shipping on orders over $149 to the contiguous United States.
All firearms must be transferred through a licensed FFL dealer. We cannot ship firearms directly to you — the firearm will be shipped to your local FFL dealer who will complete the transfer.
Questions about FFL transfers? Contact our team — we're here to help make the process smooth and compliant.
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