The Geissele Super Modular MK4 Rail is an ultra-light, precision-machined free float handguard built specifically for the AR-15 platform. Designed for rigidity, repeatable zero retention, and modular flexibility, the MK4 delivers professional-grade performance without excess weight. Machined from 7000 Series aluminum and finished in Type III hardcoat anodizing, this rail is built to handle serious use while maintaining a refined, streamlined profile. Precision Free Float Design Proprietary Barrel Nut SystemThe included barrel nut increases surface contact between the rail and upper receiver, enhancing rigidity and improving accuracy and repeatability if the handguard is removed for maintenance. True Free Float PlatformEliminates pressure on the barrel, allowing consistent harmonics and improved accuracy potential. Advanced Mounting System M-LOK on Five SurfacesAccessory slots run along five sides of the rail, allowing flexible placement for lights, grips, bipods, and mission-specific equipment while promoting airflow for cooling. Full-Length M1913 Picatinny Top RailContinuous top rail supports optics, backup irons, and night vision devices. Integrated Front Rail SectionsM1913 sections at the 3, 6, and 9 o’clock positions near the muzzle allow solid mounting of weapon lights and bipods. Lightweight Strength 7000 Series Aluminum ConstructionEngineered for durability while keeping weight minimal. Type III Hardcoat Anodized FinishAvailable in Black and Desert Dirt Color (DDC) for corrosion resistance and long-term durability. 9.3" Model Weight11.0 oz (weight varies slightly by length). Available Configurations Black9.3"10"13.5"15" Desert Dirt Color (DDC)9.3"13.5"15" Ideal For Duty rifle buildsCompetition AR setupsPrecision-focused buildsModular tactical platforms
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