The Rosco Manufacturing K9 Barrel in 5.56 NATO, 13.95 inches, nitride stainless steel (brand part no. K9-1395-HY-THEDON-556-7-M) is built around a mid-length gas system with an optimized gas port tuned to run reliably whether suppressed or unsuppressed. Rosco’s continuous-taper profile is designed to dissipate heat effectively under hard, sustained use, while shifting barrel weight rearward keeps the rifle balanced once modern optics and accessories load up the front end. The barrel carries over an updated target crown from Rosco’s Purebred series and avoids 90-degree cuts throughout, improving both harmonics and overall fit and finish.

Key Specifications

• Chambered for .223 Remington / 5.56 NATO.
• Barrel length measures 13.95 inches.
• Rifling uses a 1:7-inch twist rate.
• Finished in nitride stainless steel.
• Runs a mid-length gas system with an optimized gas port for suppressed or unsuppressed use.
• Uses a continuous-taper profile for improved heat dissipation.
• Shifts weight rearward for better balance with front-mounted accessories.
• Carries an updated target crown, carried over from Rosco’s Purebred series.
• Avoids 90-degree cuts throughout, improving harmonics, fit, and finish.

Frequently Asked Questions

Is this barrel tuned for suppressed use? Yes, the mid-length gas system uses an optimized gas port to run reliably both suppressed and unsuppressed.

Why does the barrel taper continuously? The continuous-taper profile is Rosco’s most effective design for dissipating heat under hard use.

Does barrel weight affect balance with accessories? Yes, weight is shifted rearward so front-mounted attachments keep the rifle balanced and easier to handle.

Buy the Rosco Manufacturing K9 Barrel

Build a balanced, heat-managing 5.56 AR15 upper around a barrel designed for both suppressed and unsuppressed use. Browse more Rosco Manufacturing parts in our AR barrels selection and order direct from our Lubbock, Texas gun shop for fast shipping to your door.