NBS AR-15 9310 Bolt Assembly - Nickel Boron

The complete NBS mil-spec bolt assembly for the .223 Remington/5.56x45mm is a great addition to your AR-15 platform. The quality NBS bolt assembly offers precise fit, function, and reliability for your next build. The bolt includes all of the critical parts (gas ring & extractor) and is ready to be installed in a bolt carrier.AR-15 Bolt AssemblyCaliber: .223/5.56/300AACBolt Material: 9310 SteelMPI (Magnetic Particle Inspected)Bolt Coating: Nickel BoronMADE IN THE USABACKED BY THE NBS LIFETIME WARRANTY!