Proof Research115705468
Proof Research Carbon Fiber Barrel for AR-15, 6mm ARC, 1:7.5" Twist$1,031.25
Availability: In Stock
A Proof Research AR-15 300 AAC Blackout carbon fiber barrel brings precision engineering and weight savings to your intermediate-range hunting or suppressed shooting setup. Built on a proven platform, this 16-inch carbine-length barrel delivers the velocity and accuracy shooters expect from 300 Blackout while the carbon fiber wrap reduces overall rifle weight without sacrificing rigidity. Whether you're building a subsonic hunting rifle, upgrading an existing upper, or setting up a short-range defensive carbine, this barrel gives you the quality and durability Proof Research is known for.
The 1:8-inch twist rate stabilizes the full range of 300 Blackout ammunition—from heavy subsonic loads to supersonic match rounds—making this barrel genuinely versatile across real-world use cases. Carbine-length gas system means faster handling and less wear on components compared to rifle-length systems, a practical advantage if you're running your gun hard or suppressed. The 5/8-24 TPI muzzle threads are standard for 300 Blackout suppressors, so you can easily add a can if stealth or hearing protection matters to your mission.
Carbon fiber construction isn't just about saving ounces—it improves heat dissipation compared to all-steel barrels, helping maintain zero during rapid fire or extended range sessions. Proof Research's manufacturing standards mean you're getting a barrel that shoots, and keeps shooting, without the premium price tag of some competitors. Drop this into a quality upper receiver and bolt carrier group, and you've got a rifle component built to outlast trends.
| Caliber | 300 AAC Blackout |
| Barrel Length | 16 inches |
| Gas System | Carbine Length |
| Twist Rate | 1:8 inch |
| Rifling Grooves | 5 |
| Muzzle Threads | 5/8-24 TPI |
| Construction | Carbon Fiber Wrapped |
| Manufacturer | Proof Research |
Yes. The 5/8-24 TPI muzzle threads are the industry standard for 300 Blackout suppressors and brakes, so you can attach any compatible suppressor or muzzle device.
The 1:8-inch twist is rated to handle both subsonic and supersonic 300 Blackout loads, giving you flexibility across the full range of available ammunition for this cartridge.
This barrel is designed for AR-15 style uppers with standard threading and gas port dimensions. Confirm your upper receiver is compatible with a carbine-length gas system and 5/8-24 muzzle threads before ordering. Professional installation is recommended.
Carbon fiber wrapping reduces overall weight compared to all-steel barrels while improving heat dissipation during extended shooting sessions. This helps maintain accuracy and can extend component life under heavy use.
SKU: 115782182 • Width: 3.6in • Height: 3in • Depth: 25.1in • Weight: 2.12oz
Availability: In Stock
A Proof Research AR-15 300 AAC Blackout carbon fiber barrel brings precision engineering and weight savings to your intermediate-range hunting or suppressed shooting setup. Built on a proven platform, this 16-inch carbine-length barrel delivers the velocity and accuracy shooters expect from 300 Blackout while the carbon fiber wrap reduces overall rifle weight without sacrificing rigidity. Whether you're building a subsonic hunting rifle, upgrading an existing upper, or setting up a short-range defensive carbine, this barrel gives you the quality and durability Proof Research is known for.
The 1:8-inch twist rate stabilizes the full range of 300 Blackout ammunition—from heavy subsonic loads to supersonic match rounds—making this barrel genuinely versatile across real-world use cases. Carbine-length gas system means faster handling and less wear on components compared to rifle-length systems, a practical advantage if you're running your gun hard or suppressed. The 5/8-24 TPI muzzle threads are standard for 300 Blackout suppressors, so you can easily add a can if stealth or hearing protection matters to your mission.
Carbon fiber construction isn't just about saving ounces—it improves heat dissipation compared to all-steel barrels, helping maintain zero during rapid fire or extended range sessions. Proof Research's manufacturing standards mean you're getting a barrel that shoots, and keeps shooting, without the premium price tag of some competitors. Drop this into a quality upper receiver and bolt carrier group, and you've got a rifle component built to outlast trends.
| Caliber | 300 AAC Blackout |
| Barrel Length | 16 inches |
| Gas System | Carbine Length |
| Twist Rate | 1:8 inch |
| Rifling Grooves | 5 |
| Muzzle Threads | 5/8-24 TPI |
| Construction | Carbon Fiber Wrapped |
| Manufacturer | Proof Research |
Yes. The 5/8-24 TPI muzzle threads are the industry standard for 300 Blackout suppressors and brakes, so you can attach any compatible suppressor or muzzle device.
The 1:8-inch twist is rated to handle both subsonic and supersonic 300 Blackout loads, giving you flexibility across the full range of available ammunition for this cartridge.
This barrel is designed for AR-15 style uppers with standard threading and gas port dimensions. Confirm your upper receiver is compatible with a carbine-length gas system and 5/8-24 muzzle threads before ordering. Professional installation is recommended.
Carbon fiber wrapping reduces overall weight compared to all-steel barrels while improving heat dissipation during extended shooting sessions. This helps maintain accuracy and can extend component life under heavy use.
SKU: 115782182 • Width: 3.6in • Height: 3in • Depth: 25.1in • Weight: 2.12oz