Out of stock
SKU: KNAC32304-1075
UPC: 819064016007
The Knights Armament Company KAC URX 4 M-LOK Forend Kit 556 10.75 is a modular rifle handguard assembly engineered for AR-pattern rifles chambered in 5.56 NATO. Built on the proven M-LOK accessory mounting platform, this one-piece rail system delivers the structural rigidity and stability demanded by operators running suppressed firearms, thermal optics, and multiple mounted accessories on duty or in the field.
The URX 4's defining feature is its Integral Barrel Nut (IBN) system, which eliminates the need for a separate steel barrel nut entirely—the rail itself threads directly onto the barrel extension and acts as the locking mechanism when torqued to specification. This design reduces overall weight to 1.44 lbs without sacrificing the rigidity required for precision rifle work or rapid-fire engagements. The 10.75-inch length balances standalone utility with compatibility across mid-length and rifle-length gas systems, making it suitable for carbines used in close-quarters or transitional environments. M-LOK slots along the forend accept industry-standard accessories including light mounts, vertical grips, rail panels, and cable management systems.
This forend kit serves operators, tactical units, and serious shooters who require a lightweight, modular rail system that maintains zero consistency and withstands the demands of suppressed fire and rapid accessory reconfiguration. Its construction reflects KAC's engineering philosophy: eliminate unnecessary weight while preserving the structural requirements of professional-grade carbines. The URX 4 has become standard among units that prioritize modularity without complexity.
M-LOK has become the dominant mounting standard for modern combat carbines, offering superior strength-to-weight ratios compared to legacy Picatinny rail systems. The URX 4's one-piece construction and IBN attachment method represent a significant evolution in AR handguard design, reducing assembly complexity while improving repeatability—a critical factor when maintaining zero across multiple duty cycles.
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