Engineered for precision and performance, the Geissele 10.5" Super Modular Rail MK4 M-LOK in black delivers a lightweight yet ultra-rigid free-float handguard solution for AR-15 platforms. Designed as Geissele's premium M-LOK option, this rail combines advanced modularity with exceptional strength to enhance your rifle's handling, accuracy, and customization potential. Key Features Integrated M-LOK System: M-LOK slots at the 3, 6, and 9 o'clock positions plus upper 45deg quadrants provide versatile mounting for accessories while maximizing ventilation for superior heat dissipation. Integrated Picatinny Sections: Forward M1913 Picatinny rail segments at 3, 6, and 9 o'clock positions offer reliable mounting points for lights, lasers, and other optics without adding unnecessary bulk. Proprietary Barrel Nut: The 2.25-inch long barrel nut increases surface contact with the upper receiver, ensuring a straight, true platform that improves accuracy and maintains zero repeatability during maintenance. Lightweight Construction: Crafted from 7000 Series Aluminum with extensive venting to reduce weight without compromising rigidity or durability. Specifications Length: 10.5 inches Material: 7000 Series Aluminum Finish: Type 3 Hardcoat Anodize (Black) Inner Diameter: 1.35 inches Outer Diameter (DAQ): 2.11 inches Height: 2.4 inches Weight: 10.6 oz (12.74 oz with barrel nut) Rail System: M-LOK with integrated Picatinny Profile: Free Float Why Choose This Product Whether you're building a tactical carbine or optimizing an existing AR-15, this rail addresses common pain points like excessive weight, poor heat management, and limited accessory options. Its free-float design eliminates barrel contact for improved shot consistency, while the modular M-LOK layout lets you customize exactly where you need it most. The robust construction ensures it withstands demanding use while remaining easy to handle. Upgrade your platform with a handguard trusted by professionals for its balance of strength, modularity, and precision engineering.