Geissele Automatics Super Modular Rail Features The Geissele Automatics Super Modular Rail MK16 was selected by USASOC for the URG-I program a strong endorsement of its rigidity and reliability under demanding operational use. Mounted using an updated version of Geissele s proven barrel nut design the rail installs securely to the upper receiver while offering superior rigidity compared to typical free float handguards. Anti-rotation tabs paired with set screws ensure the rail stays locked in position without shifting or rotating even after extended hard use or repeated impacts. A full-length M1913 Picatinny rail runs along the top for consistent optic mounting while M-LOK slots on every quadrant allow accessories to be positioned exactly where the shooter wants them. Machined from 7000 series aluminum the handguard balances strength with manageable weight and a Type 3 hardcoat anodized finish provides excellent resistance to wear and corrosion in the field. At 13.5 inches long this length offers extended real estate for accessories while keeping the rifle balanced and Geissele also offers 9.3 10.5 and 15 inch variants for different build requirements. The handguard s inner diameter of 1.26 inches and outer diameter of 1.59 inches are engineered to clear most gas blocks and muzzle devices without interference. Weighing approximately 13.4 ounces or 14.9 ounces with the barrel nut installed this rail delivers proven military-grade performance for serious AR-15 builds. Geissele Automatics Super Modular Rail MK16 Specifications Brand: Geissele Automatics Model: Super Modular Rail MK16 Type: Handguard Compatible Hosts: AR-15 Attachment Type: M-LOK Length: 13.5 Material: 7000 Series Aluminum Finish: Type 3 Hardcoat Anodized Color: Black Inner Diameter: 1.26 Height: 2.39 Weight: 0.9 lbs Available At: GrabAGun