This hardware kits contains everything you are going to need to mount your new stock to your AR-15. All Bravo Company is made for making some of the finest AR-15 components are these parts are no different.
Included in this kit is a Mil-Spec diameter 6-position receiver extension tube (also called a buffer tube). This receiver extension tube is machined from 7075-T6 aluminum, which is a very strong aluminum alloy. In addition to the BCM buffer, tube you also get all of the hardware you need to mount it to your AR-15 lower receiver. This included a receiver end plate and lock (castle) nut. Capping it off, this kit also includes the carbine action spring and carbine buffer.