Ballistic Advantage 300 Blackout 8" AR-15 Barrel 1:7 QPQ CMV
Ballistic Advantage
$147.25
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Ballistic Advantage
Ballistic Advantage 300 Blackout 8" AR-15 Barrel 1:7 QPQ CMV
The Ballistic Advantage 300 Blackout 8" Modern Series Barrel delivers compact, hard-hitting performance for SBR and pistol builds, combining premium 4150 CMV steel construction with a battle-ready QPQ corrosion-resistant finish.
- Machined from 4150 Chrome Moly Vanadium steel for superior strength and durability
- QPQ corrosion-resistant finish protects inside and out against harsh conditions
- 1:7 twist rate stabilizes both supersonic and subsonic 300 Blackout loads effectively
- Pistol-length gas system optimized for reliable cycling in short-barreled configurations
- 5/8x24 threaded muzzle ready for suppressors, muzzle brakes, or flash hiders
- QPQ-coated M4 feed ramp extension ensures smooth, consistent feeding under pressure
Who This Is For
This barrel is purpose-built for shooters constructing a 300 Blackout AR-15 pistol or registered SBR who demand a compact, suppressor-ready platform without sacrificing reliability or finish quality. It's an excellent choice for home defense builds, hunting in tight quarters, or anyone wanting the versatility of running both supersonic and subsonic ammunition from an 8" package.
Specifications
| Brand | Ballistic Advantage |
|---|---|
| Caliber | 300 Blackout (.300 BLK) |
| Barrel Length | 8 inches |
| Material | 4150 Chrome Moly Vanadium (CMV) |
| Finish | QPQ Corrosion Resistant |
| Profile | DRP (Dialin' Reduced Profile) |
| Twist Rate | 1:7 inches |
| Gas System | Pistol Length |
| Gas Block Journal | .750" |
| Muzzle Thread | 5/8x24 |
| Weight | 19 oz |
| Feed Ramps | M4, QPQ Coated |
| Platform | AR-15 |
Frequently Asked Questions
Can I use this barrel on a standard AR-15 with a rifle-length lower receiver?
This 8" barrel falls under NFA regulations as a short-barreled rifle (SBR) component. It may only be legally installed on a registered SBR lower receiver, a registered machine gun lower, or configured as an AR-15 pistol with a pistol lower receiver. Pairing this barrel with a standard non-NFA rifle lower receiver is prohibited by federal law. Always ensure your build is compliant before assembly.
Will this barrel cycle both supersonic and subsonic 300 Blackout ammunition reliably?
Yes — the 300 Blackout cartridge was specifically engineered to function in AR-15 platforms with both supersonic and subsonic loads. The 1:7 twist rate on this barrel is well-suited to stabilize heavier subsonic projectiles (220gr and similar) as well as lighter supersonic rounds. For subsonic use with a suppressor, some tuning of your gas system or buffer may be beneficial to ensure consistent cycling.
What size gas block do I need for this barrel?
This Ballistic Advantage barrel features a .750" gas block journal, so you will need a low-profile or standard gas block with a .750" inside diameter. This is one of the most common gas block sizes for AR-15 builds, giving you a wide selection of compatible aftermarket options. Make sure your gas block is properly pinned or set-screwed and aligned with the gas port for reliable function.
