If you want to give your custom AR-15 a more tactical look and the ability to add more components, this quad rail system is for you! Reasonably priced, this 2-piece quad rail will allow you to mount accessories to your M4 or AR-15 carbine. It replaces the standard hand guard and is easy to install. 6.5 inches in length and finished in matte black. Installation instructions included. If you have additional questions about installation, please give us a call. (gun & other parts sold separately)