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CMMG CMMG57DBC33
California Proposition 65 Warning

This product can expose you to chemicals including lead, known to cause cancer and birth defects. For more info visit P65Warnings.ca.gov.

CMMG

$474.95
Low Stock (1 left) California compliant

CMMG Barrel and BCG Kit, 5.7X28MM, 5" Barrel, Black, Fits AR Rifles 57DBC33

Key Details
Brand CMMG
Manufacturer Part Number 57DBC33
UPC 810097502390
SKU CMMG57DBC33
Current Stock 1 available
Quantity Updated Apr 25, 2026 10:25 PM
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Purchase Requirements
  • Final availability is confirmed at checkout.
In-Store Pickup Required: All firearm purchases must be picked up at our Beverly Hills location after background check completion.
Product Description

The 5" 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).

Features
  • 5 5.7x28mm Barrel"
  • 5.7x28mm Bolt Carrier Group
  • Black
Specifications
UPC: 810097502390
Manufacturer: CMMG
Manufacturer Part #: 57DBC33
Barrel Length: 5"
Type: Barrel