Stern Defense 9mm BU9 NIB AR-15 Bolt Nickle-Boron Finish

The Stern Defense 9MM BU9 NIB bolt for AR-15 brings a reliable 9mm Luger bolt solution to rifle bolt parts, delivering smooth cycling and dependable performance for enthusiasts seeking a versatile AR-15 platform upgrade. Engineered with a Nickle-Boron finish, this M16-style bolt enhances wear resistance and corrosion protection, helping maintain consistent function in diverse field conditions. Designed for 9mm Luger cartridges, it integrates seamlessly into AR-15 builds that aim to run 9mm throu