Product DescriptionThe Geissele Super Modular Rail (SMR) MK8 M-LOK is an ultra-modular, free-float AR-15 handguard designed to deliver a strong, rigid mounting platform with extensive accessory compatibility. Built around Magpul M-LOK attachment at the 3, 6, and 9 o'clock positions (plus the upper 45-degree quadrants), the MK8 offers true modularity while maintaining a streamlined profile. Maximum venting along the lower 45-degree quadrants promotes excellent heat dissipation and helps reduce overall weight. The MK8 also uses Geissele's proprietary 2.25-inch barrel nut to increase receiver interface surface area for a rail that stays straight and true along its full length-helping maintain accuracy and zero repeatability after maintenance. Installation requires a Geissele barrel nut wrench (sold separately).Product Highlights 13.5-inch free-float MK8 rail with Magpul M-LOK slots for modular accessory mounting Extensive venting for improved heat dissipation and reduced overall weight Rigid, trusted platform enabled by Geissele's proprietary 2.25-inch barrel nut interface Top Picatinny rail section supports optics, sights, and other rail-mounted accessories Black anodized finish for durability and a professional, low-reflection appearanceSpecs Brand: Geissele Automatics Model: Super Modular Rail (SMR) MK8 Attachment System: M-LOK Top Rail: Picatinny Color/Finish: Black anodized (Type III hardcoat anodized) Material: 6061-T6 aluminum Length: 13.5 in Height: 2.3 in Inner Diameter: 1.35 in Outer Diameter: 2.11 in Weight (with hardware): 13.1 oz Barrel Nut: Included; 2.25 in proprietary Geissele barrel nut (barrel nut wrench sold separately) Fit: AR-15 Country of Manufacture: USA UPC: 854014005793 Manufacturer Part Number: 05-285BDisclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product's manufacturer.