Rosco Manufacturing K9 AR-15 5.56 NATO 12.5" Stainless Steel Barrel - Nitride - Sage Dynamics

The Rosco Manufacturing K9 12.5" is a premium 5.56 NATO AR-15 barrel developed in collaboration with Sage Dynamics. Built around Rosco's proprietary "patrol length" gas system - engineered to run smoother than carbine length and more reliably than mid-length - this barrel is purpose-built for hard-use short-barreled AR platforms.

The K9 is machined from stainless steel and finished in black nitride for excellent corrosion and wear resistance under sustained fire and suppressed use. A 1:7 twist rate and 5.56 NATO chambering allow this barrel to stabilize a wide range of projectiles. The barrel is threaded 1/2x28 for standard muzzle devices and suppressors, ready to drop into your next SBR, pistol, or compact carbine build.

Whether you are assembling a defensive carbine, a duty-grade patrol rifle, or a hard-use training upper, the K9 pairs modern materials, an innovative gas length, and Sage Dynamics' real-world testing pedigree into one package.