The Sig Standard Match-Grade, drop-in performance upgrade barrel is CNC machined form 4340H steel billet which results in superior corrosion resistance and durability. It has a PVD coating that creates a durable barrier against wear and a target-crowned muzzle.
Rival Arms RA20P301A Precision Drop-In Barrel 9mm Luger 3.90″ Black PVD Finish 4340H Steel Material for Sig P320 Carry
