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October 2, 2025CMMG 99D17C3 Replacement Barrel Kit with Bolt Carrier Group, 9mm Luger 5″ Threaded, Black, Radial Delayed Blowback, Fits AR-Platform
$465.45
CMMG 99D17C3 Replacement Barrel Kit with Bolt Carrier Group, 9mm Luger 5″ Threaded, Black, Radial Delayed Blowback, Fits AR-Platform
10 in stock
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.
UPC | 815835019796 |
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Manufacturer | CMMG |
Manufacturer Part Number | 99D17C3 |
Caliber/Gauge | 9mm |
Length | 13.9500 |
Sights | No |
Model | Replacement Barrel |
Rate of Twist | 1:10" |
Barrel Length | 5" |
Product Type | Barrel |