CMMG 5" 9mm Barrel and BCG Kit Radial Delayed Blowback

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. Features 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.