Thompson Center Encore Prohunter Katahdin Rifle Barrel .338 ARC 20" 5/8-24 Threaded Stainless

The Thompson Center Encore Prohunter Katahdin rifle barrel in .338 ARC is a fast-swappable centerfire barrel that unlocks the versatility the Encore platform is built for. If you already own an Encore rifle, this 20-inch stainless barrel transforms your gun into a dedicated .338 ARC shooter without buying a second rifle. The .338 ARC is gaining traction among hunters and precision shooters who want a capable intermediate cartridge that hits harder than 5.56 but runs efficiently in AR-pattern ergonomics and Encore-compatible platforms. Thompson Center's reputation for quality manufacturing means you're getting a precision-machined barrel backed by decades of American gunmaking.

Swapping barrels on the Encore is one of the platform's defining features—no gunsmiths, no special tools, just straightforward modularity. This particular barrel features a 5/8-24 threaded muzzle, giving you the option to run a suppressor, muzzle brake, or flash hider if your setup calls for it. Stainless steel construction resists corrosion, making it a solid choice whether you're hunting in wet conditions or storing your rifle long-term. At 20 inches, you get a manageable hunting profile without sacrificing velocity or sight radius.

This barrel works with Thompson Center Encore rifle platforms, letting you tailor your firearm to your specific hunt or range session. Whether you're pursuing medium to large game or testing loads at distance, the .338 ARC brings serious capability to a compact, adaptable platform.

Key Features

• .338 ARC caliber—a modern intermediate cartridge for hunters and shooters seeking hard-hitting performance
• 20-inch barrel length for practical handling and sight radius
• 5/8-24 threaded muzzle for suppressors, brakes, or other muzzle devices
• Stainless steel construction resists corrosion in field and storage conditions
• Quick-swap barrel design—change calibers and configure your Encore for different hunts without additional firearms
• Precision-manufactured by Thompson Center, America's trusted modular rifle platform maker

Specifications

Frequently Asked Questions

What Encore rifles does this barrel fit?

This barrel is designed for Thompson Center Encore Prohunter Katahdin rifle platforms. The Encore is known for its interchangeable barrel system, so confirm your specific Encore model is compatible before purchasing.

Can I use a suppressor on this barrel?

Yes. The 5/8-24 threaded muzzle accepts standard suppressors, muzzle brakes, and flash hiders with that thread pitch. You'll need a suppressor rated for .338 ARC.

What is .338 ARC and what is it good for?

.338 ARC is a modern intermediate rifle cartridge designed for hunters and shooters who want more power than 5.56 NATO in a compact, efficient platform. It's effective on medium to large game and has gained popularity among precision shooters for its consistent performance and magazine-compatible design in many platforms.

Do I need special tools to swap this barrel onto my Encore?

The Encore is engineered for user-friendly barrel changes. Refer to your Encore rifle's manual for detailed instructions, but the platform does not typically require gunsmithing to swap barrels.