ProMag Quad Rail Hand Guard two piece MIL-Spec Picatinny rails at the 12, 3, 6 and 9 o'clock positions. Used for mounting sights, tactical lights, vertical grips and other accessories. Constructed of a high impact glass filled nylon polymer with integral aluminum heat shield inserts. Type Handguard Finish Black Series Handguard Features Quad Rail Material Polymer with Aluminum Heat Shield Insert Firearm Type Rifle Firearm Model AR-15 Carbine