Rosco K9 11.5″ Patrol-Length Barrel 1:7 5.56 NATO

Description

The Rosco Manufacturing K9 11.5″ patrol-length barrel is built for compact AR-15 platforms where controllability and reliable gas operation are priorities. It features a patrol-length gas system with an optimized gas port engineered to run reliably whether suppressed or unsuppressed. The continuous taper contour and updated target crown are intended to improve heat dissipation, harmonics, and fit-and-finish for sustained use. Finished with a nitride treatment, the barrel balances a compact profile with practical durability for short-barrel rifle builds.

Key Specifications

• The manufacturer is Rosco Manufacturing.
• The model is K9.
• The barrel length is 11.50 inches.
• The cartridge specification is .223 REM/5.56 NATO.
• The rate of twist is 1:7.
• The finish is Nitride.
• The muzzle threads are 1/2-28.
• The gas system length is Patrol.
• The contour is Continuous taper.
• The barrel weight is 1.25 lbs.

With its compact patrol-length gas system, nitride finish, and tuned geometry, the K9 11.5″ is a straightforward option for builders seeking a short, reliable AR-15 barrel that handles modern accessories well and is optimized to function with or without a suppressor. Its balance of durability and compact handling makes it a practical choice for duty-style or compact utility builds where reliable gas operation and manageable weight matter.