Agency Arms Premier Line Barrel focuses on attention to every detail. It has added performance from polished feed ramp and a polished crown to reduce friction. The barrel is constructed of 416R stainless steel with pulled broached rifling and 8 octagonal flutes machined around the circumference of the barrel. Caliber information is machined on the rear, a large “A” on the top, and a “Agency” on the port side of the lockup. This match grade, non-threaded model is compatible with Glock 17 with a Titanium Ntiride (gold) finish.