Geissele Automatics Super Modular Rail MK4 13.5" M-LOK AR-15 Handguard - Black

The Geissele Automatics Super Modular Rail (SMR) MK4 is a precision-engineered 13.5" free-float handguard purpose-built for the AR-15 platform. Machined from 7075-T6 aluminum and finished in a black hardcoat anodize, this handguard delivers the strength, rigidity, and weight savings serious shooters demand from a duty-grade rail system.

The MK4 features integrated M1913 Picatinny rail sections at the 3, 6, and 9 o'clock positions for solid accessory mounting, with M-LOK slots along the remaining length for attaching lights, lasers, foregrips, and bipods. Geissele's proprietary barrel nut and mounting system lock the rail down along the full length of the barrel, eliminating contact and ensuring consistent, shift-free point of impact.

At 13.5 inches, the SMR MK4 is a natural fit for mid-length and rifle-length AR-15 builds, offering plenty of real estate for accessories without unnecessary weight. The free-floating design protects accuracy by preventing the rail from making contact with the barrel under any conditions. This handguard is built to Geissele's exacting tolerances for mil-spec quality and combat-proven performance.