Geissele M-LOK Black Rail Panels 04-428B are durable grip panels designed to snap into M-LOK slots, providing enhanced ergonomics and a customizable rail surface without adding bulky Picatinny segments. Made in the USA from reinforced polymer, these lightweight panels offer confident handling and modularity for modern rifle platforms. Material: glass-filled polymer with textured surface for secure grip Compatible with any standard M-LOK slot spacing Slim and lightweight, adding minimal bulk or weight Easy snap-on installation and removal without tools Matte black finish for low-glare and durable wear Geissele M-LOK Black Rail Panels 04-428B