The Faxon 16" Gunner Profile 5.56 NATO AR-15 barrel is a hybrid of the Government and Pencil profiles - Govt durability and dwell where it matters with Pencil weight savings up front. The result is a barrel that swings faster on transitions and runs longer in carbines used for training, defense, or duty. Specs: Caliber: 5.56 NATO (.223 Remington compatible) Length: 16" Profile: Gunner (Govt / Pencil hybrid) Twist: 1:8 - runs 55-77gr loads accurately Gas system: Mid-length Material: 4150 Mil-Spec CMV chromoly Finish: Nitride in and out Muzzle: 1/2x28 threaded Crown: 11-degree target crown QC: Stress relieved, air-gauge tested, individually headspaced Made in Cincinnati, OH Build pairing: drops into any mil-spec AR-15 upper with a low-profile gas block sized for .750" journal. Pair with a quality mid-length gas tube and 16" handguard. For a quieter setup, the 1/2x28 muzzle accepts standard 5.56 brakes, flash hiders, or suppressor mounts. Headspace is set at the factory. Run a 100-200 round break-in with quality ammunition and re-check torque on the barrel nut after the first range trip.