Introducing the Geissele Automatics MK4, Super Modular Rail, Handguard, 13.5, M-LOK, Barrel Nut Wrench Sold Separately (GEI-02-243), Gas Block Not Included, Desert Dirt Color, Product Finishes, Shade Variations, and Other Imperfections Are Normal Due to the Manufacturing Process 05-278S, a top-tier rail system designed by Geissele Automatics. Crafted with precision and durability in mind, this rail system combines lightweight construction with superior strength. The 13.5-inch length allows for ample space to mount your favorite accessories, while the MLOK design provides flexibility in customization. The Desert Dirt Color (DDC) finish adds a rugged and stylish look to your firearm. Built to handle the toughest conditions, the GEISSELE 13.5 SUPER MOD RAIL MK4 MLOK DDC, HANDGUARD, 05-278S is a must-have upgrade for any tactical enthusiast.