Description
Black Nitride AR15 Bolt made from Carpenter 158 steel. The bolts are also Shot Peened and MPI (Magnetic Particle Inspected) and feature Billet Machined Extractors with Black Insert and O-Ring upgrade. The fact that it is a Surface Treatment (Molten Salt Bath) and not a coating gives it better durability and boasts some of the best lubricity and corrosion protection of any finish out there.
