CMMG 5" Barrel and BCG Kit 9mm

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CMMG 5" Barrel and BCG Kit 9mm

The CMMG 5" Barrel and BCG Kit in 9mm is an excellent choice for building a Pistol Caliber Carbine with CMMG's Patent Pending Radial Delayed Blowback System. This kit is designed to work exclusively with mil-spec AR-15 upper receivers with a modified ejection port, and most mil-spec AR15 lowers when used with 9 AR Conversion mags and CMMG MkGs Mk17 and Mk9* lower. Unlike direct blowback systems, RDB slows the BCG, reducing felt recoil and resulting in a lighter BCG for a more lightweight rifle. The kit is precisely manufactured and offers long-term reliability and durable construction for a quality build.

*Older Mk9 lowers will require a CMMG retrofit kits to convert it to a Radial Delayed Blowback compatible lower, instead of Traditional Blowback.


  • Precise Manufacturing
  • Long Term Reliability
  • Durable Construction

All NFA/ATF Rules Apply
You may use this AR 15 barrel with a lower receiver that is a Registered SBR, Machine Gun, or Pistol. Possession of this barrel along with a Non-NFA lower receiver is Prohibited, except when installed on a Pistol configuration firearm. Check your local laws and jurisdictions.


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