Proof Bbl Cf Pr15 338Arc 16 Pistol .750 1-8
$999.00
$1,149.00
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$150.00
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The Proof Research barrel for the .338 ARC is a carbon fiber rifle barrel built for shooters pushing a modern intermediate cartridge in a compact platform. This 16-inch barrel is threaded for a pistol-length gas system and designed to work with AR-15 builds that need the power of .338 ARC in a shorter, lighter package. If you're building a specialized AR pistol or short-barreled rifle around this hard-hitting caliber, Proof Research's track record in precision barrel manufacturing means you're starting with a component that won't hold you back.
Carbon fiber construction keeps weight down without sacrificing rigidity—a real advantage when you're building something compact. The 1-in-8 twist rate is optimized for .338 ARC bullet weights, and the pistol-length gas system keeps the overall footprint manageable. The .750-inch gas journal and 5/8-24 muzzle threading are industry-standard dimensions, giving you flexibility in suppressor choice and gas block compatibility.
Proof Research barrels are known for attention to detail in chamber work and bore finishing. Whether you're assembling a hunting rig, a specialized tactical build, or an overlanding platform where compact firepower matters, a quality barrel is where accuracy begins. This one handles the engineering so you can focus on the shooting.
Key Features
- Carbon fiber construction for lightweight, rigid performance
- 16-inch length optimized for .338 ARC ballistics in a compact form factor
- 1-in-8 twist rate matched to .338 ARC bullet selection
- Pistol-length gas system for AR-15 pistol and SBR builds
- 5/8-24 muzzle threading for suppressor compatibility
- .750-inch gas journal for standard AR-15 gas blocks
Specifications
| Caliber | .338 ARC |
| Barrel Length | 16 inches |
| Twist Rate | 1-in-8 |
| Gas System Length | Pistol |
| Gas Journal Diameter | .750 inch |
| Muzzle Thread | 5/8-24 |
| Construction | Carbon Fiber |
| Brand | Proof Research |
Frequently Asked Questions
What AR-15 builds does this barrel fit?
This barrel is designed for .338 ARC AR-15 pistols and short-barreled rifles. It uses a standard .750-inch gas journal, so it's compatible with common AR-15 pistol-length gas blocks. You'll need a receiver and lower designed for .338 ARC.
Can I use a suppressor on this barrel?
Yes. The barrel is threaded 5/8-24, which is a standard suppressor mounting thread. Make sure your suppressor is rated for .338 ARC.
Why is the 1-in-8 twist rate important for .338 ARC?
The 1-in-8 twist rate is optimized for the bullet weights commonly used in .338 ARC loads. This ensures proper bullet stability across the velocity range you'll get from a 16-inch barrel.
What's the advantage of a carbon fiber barrel?
Carbon fiber barrels are significantly lighter than steel while maintaining rigidity. For a compact platform like a 16-inch AR pistol, that weight savings is valuable without compromising accuracy or durability.
