AB Arms LTF 7-5-4 Slot Rails, Black Light weight polymer material reinforced with high strength fibers Continuous Mil Spec picatinny rail designed to deliver maximum reliability Integrated hardware molded directly into the part to add strength, durability and eliminate the need for additional mounting hardware Bolts and lock washers included with each rail section High heat resistance Light weight polymer material reinforced with high strength fibers Continuous Mil Spec Picatinny rail designed to deliver maximum reliability Integrated hardware molded directly into the part to add strength and durability High heat resistance