Geissele Automatics Super Modular Rail MK20 - M-LOK - Black - 12.6"

When weight savings is the primary consideration and you refuse to sacrifice rigidity, the Geissele MK20 12.6" Super Modular Rail delivers one of the lightest all-aluminum AR-15 handguards available at just 9.7 oz — developed specifically to meet strict weight requirements for U.S. Border Patrol rifles without compromising the Super Stiff strength level Geissele is known for.

The Geissele MK20 Super Modular Rail is an M-LOK handguard designed for AR-15 shooters who need a free-float, modular rail system that keeps overall rifle weight as low as possible while maintaining the rigidity required for accurate, consistent shooting with lights, lasers, and vertical grips attached.

The MK20's skeletonized design removes material from non-critical structural areas through careful engineering — maintaining stiffness where it matters at the barrel nut interface and along the accessory mounting surfaces, while eliminating mass everywhere else. The result is a handguard that achieves Super Stiff rigidity at a weight that most handguards of similar length and material cannot match. The Geissele Barrel Nut is an easy on/off design that installs with a standard armorers' wrench, simplifying installation and removal without proprietary tools. Anti-rotation tabs and set screws ensure the MK20 locks positively to the upper receiver without any tendency to rotate under vigorous use — a critical detail for zeroing stability of any lights or lasers mounted to the rail. The top rail is full-length M1913 Picatinny for optic and accessory mounting, while M-LOK slots at 3, 6, and 9 o'clock provide comprehensive accessory mounting points across the entire handguard length.

Length: 12.6". Weight: 9.7 oz. Material: 7000 series aluminum. Finish: Type 3 hardcoat anodize, black. Top rail: M1913 Picatinny. Side/bottom: M-LOK. Inner diameter: 1.36". Outer diameter: 1.59" (DAQ). Height: 2.388". Anti-rotation tabs and set screws included. Geissele Barrel Nut included. Compatible with standard mil-spec AR-15 upper receivers.

7000 series aluminum with Type 3 hardcoat anodize provides the corrosion resistance and surface hardness required for duty and hard-use applications. The skeletonized design minimizes weight without compromising the rail's structural integrity under accessory loading and recoil stress.

The definitive choice for weight-conscious AR-15 builds where a minimal, light, and rigid M-LOK handguard is required — ideal for patrol rifles, competition builds, and any platform where ounces matter without sacrificing accessory mounting capability.

Backed by Geissele's manufacturer warranty. Geissele Automatics is a leading manufacturer of precision AR triggers, handguards, and accessories based in North Wales, Pennsylvania.