These Long Locking Rail Panels from BLACKHAWK! protect your unused rail sections from damage and give you an excellent positive gripping surface. Protect yourself from weapon heat and sharp rail edges. These panels are made of tough, rigid polymer and use the BLACKHAWK! Rail-Lok integral locking mechanism to keep them securely in place. These low-profile rail panels improve the look, feel and control of your firearm. The long rail panels are perfect for providing full coverage on an AR-15/M4 Carbine length forend rail.