AR-15 Nickel Boron Bolt Assembly w/ Nickel Boron Cam, Firing & Retaining Pins This is a complete bolt completion kit finished in Nickel Boron. This kit comes with everything you need to complete your bolt carrier group other than the carrier itself. These are perfect kits to keep as a spare or backup for your BCG. It’s important to always have back-up parts, especially a premium back up bolt, in the event that you need a replacement or decide to upgrade your M16 or AR15 with a durable Nickel Boron AR bolt. Specs: Bolt: Enhanced 9310 steel Heat treated to military specifications Shot Peened MPI Nickel Boron Finish Extractor: Billet Tool Steel Extractor Heat treated to military specifications Shot peened Mil-Spec Extractor Spring, black extractor insert, O-Ring Nickel Boron Finish Cam Pin: Machined to Mil Spec Ground to meet military required tolerances Nickel Boron Finish Firing Pin: Shrouded Firing Pin with Mil-Spec Hard Chrome Finish This high quality item comes with the Barrier Defense lifetime warranty! ****Know your states laws when purchasing gun parts.****