text: CMMG 99D17C3 Replacement Barrel Kit with Bolt Carrier Group, 9mm Luger 5″ Threaded, Black, Radial Delayed Blowback, Fits AR-Platform
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  CMMG’s 9mm Barrel and BCG Kit allow you to build a Pistol Caliber Carbine using CMMG’s Patent Pending Radial Delayed Blowback System. Unlike typical direct blowback systems, RDB uses a bolt that is forced to rotate and unlock, slowing the BCG. This results in a lighter BCG for a lighter rifle, and less felt recoil than a straight blowback system. Their Barrel and Bolt Kits are designed to work exclusively with mil-spec AR-15 upper receivers with a modified ejection port, like their MkG/MkGs upper, and most mil-spec AR15 lowers when used with 9 AR Conversion mags as well as their MkGs Mk17 and Mk9* lowers. Other manufacturers receivers may work, but we cannot guarantee function or reliability.*Older Mk9 lowers will require one of their retrofit kits to convert it to a Radial Delayed Blowback compatible lower, instead of Traditional Blowback.
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  Please note that the products listed on our website are sourced directly from our suppliers’ feeds. As such, these items are not held in our local inventory but are available for order. We strive to ensure the most accurate and up-to-date availability information. For any queries regarding product availability or shipping times, please contact us.
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  Please be advised that some of the products available through our website may not comply with specific regulations set by the State of New York. We encourage customers to check the compliance status of each product before making a purchase. If you need more information regarding product compliance, please contact us directly.
  You can also research here: https://gunsafety.ny.gov/