“CMMG 57D0476 Replacement Barrel Kit with Bolt Carrier Group, 5.7x28mm 16.10″ Threaded, Black, Radial Delayed Blowback, Fits AR-Platform” has been added to your cart. View cart

YHM MINI QD MUZZLE BRAKE 9MM 5/8″-24
March 9, 2026
YHM RIFLE LENGTH GAS TUBE BLK
March 9, 2026CMMG 30D810A Barrel Sub-Assembly 300 Blackout 8″ Black Nitride Finish 4140 Chromoly Steel Material Pistol Length with Medium Taper Profile for AR-15
$194.66
CMMG 30D810A Barrel Sub-Assembly 300 Blackout 8″ Black Nitride Finish 4140 Chromoly Steel Material Pistol Length with Medium Taper Profile for AR-15
6 in stock
SKU: RSR|CMMG30D810A
Category: AR Barrels
Perfect for building your custom AR15 upper group. Comes with properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced.
| UPC | 815835016283 |
|---|---|
| Manufacturer | CMMG |
| Manufacturer Part Number | 30D810A |
| Barrel Length | 8" |
| Caliber/Gauge | .300 AAC Blackout |
| Length | 8" |
| Model | Barrel Sub-Assembly |
| Product Type | Barrel |
| Rate of Twist | 1:7" |





