AIM Surplus just introduced their new 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. Black Nitride is quickly becoming the go-to finish for AR parts. 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. If you’re building a BCG or need a great backup/replacement Bolt, this is a great option for just $49.95 with FREE SHIPPING at www.AIMSurplus.com.