The Bravo Company BCM Mil-Spec Mounting Kit comes complete with everything you'll need to install your mil-spec stock assembly to your lower receiver. These AR15 Lower Parts by Bravo Company MFG make installing your stock quick and easy, with a receiver extension, receiver end plate, lock nut, and more. Compatible with stocks from a wide range of manufacturers, this Bravo Company BCM M4 Stock Mounting Hardware is a must-have for anyone wanting to install their own stock.Specifications and Features: Manufacturer Number: BCM-STOCK-HARDWARE-KIT 7075-T6 aircraft grade aluminum Mil-spec hard coat type III anodized Mil-spec dimensions Black