Geissele Automatics Super Modular Rail MK4 13.5" M-LOK Handguard - DDC

The Geissele Automatics Super Modular Rail MK4 is a lightweight, free-float M-LOK handguard purpose-built for the AR-15 platform. Machined from rugged 7000 Series Aluminum and finished in Geissele's signature Desert Dirt Color (DDC) hardcoat anodized coating, this 13.5" rail delivers a corrosion-resistant mounting platform that keeps weight to a minimum without giving up strength.

Built around Geissele's proprietary 6-bolt barrel nut interface, the MK4 uses anti-rotation tabs and set screws to keep the rail locked in place even under hard use. The handguard ships with a matching barrel nut (barrel nut wrench sold separately) and integrates short M1913 Picatinny rail sections at the 3, 6, and 9 o'clock positions for lights, lasers, or forward grips. A continuous full-length Picatinny top rail provides an uninterrupted mounting surface for optics and back-up iron sights.

Multiple M-LOK slots along the sides and bottom allow direct attachment of modern accessories, while the slim 2.4" outer profile keeps the grip comfortable. Internal diameter measures 1.35" with an outer diameter of 2.11", and the handguard tips the scales at just 11.8 oz (13.5 oz including the barrel nut). The MK4 is proudly Made in the USA.