Rosco Mfg K9-1395-Hy-Thedon-556 K9 5.56 Nato 13.95" Nitride S/S Brl

The Rosco Manufacturing K9 5.56 NATO 13.95" nitride stainless steel barrel is purpose-built for shooters who want a mid-length gas system with the accuracy and handling characteristics of a modern tactical rifle. This 13.95" barrel pairs the smooth, reliable mid-length gas tube with Rosco's signature K9 continuous taper profile—a design that shifts weight rearward to reduce muzzle-heavy feel, improve balance, and dissipate heat effectively under sustained fire. Whether you're running suppressed, unsuppressed, or planning to switch between both, the optimized gas port is tuned to cycle reliably in either configuration.

The barrel itself is 416R stainless steel finished in nitride—a hard, corrosion-resistant coating that holds up to field use and doesn't break the bank like some premium finishes. The 1/7 twist handles the full range of 5.56 loads, and the standard 1/2 x 28 thread accepts any common muzzle device. The target crown is an updated design inherited from Rosco's Purebred line, refined for improved harmonics and a clean fit with whatever you thread on front. The .750" gas block size is compatible with standard AR gas blocks.

At 13.95 inches, this barrel gives you the velocity advantage of a mid-length system in a compact package—ideal for SBR builds, home-defense rifles, or any setup where you want ballistic performance without excessive length. Pair it with a handguard of at least 10 inches to avoid gas tube interference and maintain the design's intended balance and ergonomics.

Key Features

• Mid-length gas system for reliable, smooth cycling suppressed and unsuppressed
• K9 continuous taper profile reduces muzzle-heavy feel and improves handling
• Optimized gas port tuning for consistent performance across ammo variations
• 416R stainless steel with nitride finish for durability and corrosion resistance
• Updated target crown from Rosco's Purebred series for improved harmonics
• Weight-rearward design balances modern rail systems and optics
• Standard 1/2 x 28 thread for any muzzle device
• 1/7 twist accommodates standard and heavier 5.56 ammunition

Specifications

Frequently Asked Questions

Will this barrel run reliably with a suppressor?

Yes. Rosco optimized the gas port on the K9 to cycle reliably both suppressed and unsuppressed, so you won't need to swap barrels or adjust gas blocks if you run cans on occasion.

What's the minimum handguard length for this barrel?

Rosco recommends a handguard of at least 10 inches with the 13.95" barrel to clear the mid-length gas tube and maintain proper balance and ergonomics.

What twist rate does this barrel have?

The K9 13.95" features a 1/7 twist, which stabilizes a wide range of 5.56 NATO projectiles from standard 55-grain loads through heavier match and tactical rounds.

What muzzle devices will fit this barrel?

The barrel has a standard 1/2 x 28 muzzle thread, compatible with any AR-platform muzzle brake, flash hider, or suppressor adapter in that size.