Geissele 13.5" Spr Mod Mk4 Mlok

The Geissele 13.5" Spr Mod Mk4 Mlok is a purpose-built ultra-lightweight handguard designed for operators who prioritize minimal weight without sacrificing rigidity or modularity. This handguard is engineered for use in tactical environments, making it ideal for professionals running AR-pattern rifles.

Designed around the M-LOK attachment standard, this 13.5-inch rail features integrated Picatinny rail sections located at the 3, 6, and 9 o'clock positions, providing flexibility for mounting optics, lights, and tactical accessories. The rail achieves its lightweight design at 1.5 pounds through aggressive ventilation cutouts that enhance heat dissipation while maintaining strength and indexed geometry.

This design offers operators a balanced sight radius while keeping the front sight and optic mounting zone accessible for co-witnessed setups or alternative sight planes, enhancing overall weapon handling during extended operations. The 13.5-inch length of the rail is compatible with standard 5.56 NATO/.223 Remington builds, making it suitable for both mid-length and rifle-length gas systems.