Agency Arms Premier Line Barrel focuses on attention to every detail. It has added performance from polished feed ramp and 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, while a large "A" on the top, and "Agency" are machined on the port side of the lockup. This match grade, non-threaded model is compatible with Glock 17 with a stainless steel finish.