Availability: In Stock
Current Stock: Out of stock
Building a reliable .300 Blackout upper on a budget doesn't mean cutting corners on barrel quality. This CMMG 16.1" stainless steel AR-15 barrel delivers the straightforward performance you need for subsonic loads, hunting, or suppressed shooting without the premium markup. It ships with a properly installed M4 extension and comes pre-headspaced, so you can get straight to assembly instead of troubleshooting headspace issues. Stainless steel naturally resists corrosion in the field and during storage, making it a practical choice for hunters and shooters who expect their rifle to hold up across seasons and climates.
The 16.1-inch length hits the sweet spot for .300 Blackout—long enough to stabilize subsonic ammunition reliably while keeping the overall package compact and maneuverable. The carbine-length gas system keeps the bolt carrier group cycling smoothly at moderate velocities, and the 1:7 twist rate stabilizes both heavy subsonic and lighter supersonic rounds. A medium taper contour balances weight savings with barrel stiffness, useful if you're running a suppressor and want consistent zero. The 5/8-24 threads are the standard for most commercial suppressors, so you've got options when you're ready to add one.
Whether you're completing a precision .300 BLK build or refreshing an upper on a proven platform, a quality barrel from a known AR builder like CMMG cuts guesswork out of the equation. This one's ready to headspace correctly and cycle ammo as intended—no additional machine work required.
| Barrel Length | 16.1" |
| Chambering | .300 AAC Blackout |
| Contour | Medium Taper |
| Twist Rate | 1:7 |
| Gas System | Carbine |
| Muzzle Threads | 5/8-24 |
| Material Finish | Stainless Steel (Bead Blasted) |
| Barrel Extension | M4 (Installed) |
Yes. The 5/8-24 muzzle threads are the standard for most .300 Blackout suppressors, so you can thread on most commercial cans without adapters.
The 1:7 twist rate and carbine-length gas system are designed to handle both subsonic and supersonic .300 Blackout loads. Subsonic performance depends on your specific ammunition and complete upper assembly tuning, but this barrel is configured to support it.
No. The barrel ships with a properly installed M4 extension and comes pre-headspaced, so you can proceed directly to upper assembly.
This barrel is stainless steel with a bead-blasted finish, which resists corrosion and provides a durable, matte appearance.
SKU: 115693409 • Width: 1.6in • Height: 1.6in • Depth: 18.1in • Weight: 2oz
Availability: In Stock
Current Stock: Out of stock
Building a reliable .300 Blackout upper on a budget doesn't mean cutting corners on barrel quality. This CMMG 16.1" stainless steel AR-15 barrel delivers the straightforward performance you need for subsonic loads, hunting, or suppressed shooting without the premium markup. It ships with a properly installed M4 extension and comes pre-headspaced, so you can get straight to assembly instead of troubleshooting headspace issues. Stainless steel naturally resists corrosion in the field and during storage, making it a practical choice for hunters and shooters who expect their rifle to hold up across seasons and climates.
The 16.1-inch length hits the sweet spot for .300 Blackout—long enough to stabilize subsonic ammunition reliably while keeping the overall package compact and maneuverable. The carbine-length gas system keeps the bolt carrier group cycling smoothly at moderate velocities, and the 1:7 twist rate stabilizes both heavy subsonic and lighter supersonic rounds. A medium taper contour balances weight savings with barrel stiffness, useful if you're running a suppressor and want consistent zero. The 5/8-24 threads are the standard for most commercial suppressors, so you've got options when you're ready to add one.
Whether you're completing a precision .300 BLK build or refreshing an upper on a proven platform, a quality barrel from a known AR builder like CMMG cuts guesswork out of the equation. This one's ready to headspace correctly and cycle ammo as intended—no additional machine work required.
| Barrel Length | 16.1" |
| Chambering | .300 AAC Blackout |
| Contour | Medium Taper |
| Twist Rate | 1:7 |
| Gas System | Carbine |
| Muzzle Threads | 5/8-24 |
| Material Finish | Stainless Steel (Bead Blasted) |
| Barrel Extension | M4 (Installed) |
Yes. The 5/8-24 muzzle threads are the standard for most .300 Blackout suppressors, so you can thread on most commercial cans without adapters.
The 1:7 twist rate and carbine-length gas system are designed to handle both subsonic and supersonic .300 Blackout loads. Subsonic performance depends on your specific ammunition and complete upper assembly tuning, but this barrel is configured to support it.
No. The barrel ships with a properly installed M4 extension and comes pre-headspaced, so you can proceed directly to upper assembly.
This barrel is stainless steel with a bead-blasted finish, which resists corrosion and provides a durable, matte appearance.
SKU: 115693409 • Width: 1.6in • Height: 1.6in • Depth: 18.1in • Weight: 2oz