The Knight's Armament SR-15 KS-4 16" 5.56 NATO Rifle represents the next evolution of the legendary SR-15 platform, bringing enhanced durability, refined ergonomics, and cutting-edge performance to one of the most respected rifles in the industry. Built around a 16-inch cold hammer forged, chrome-lined barrel and the updated URX 6 M-LOK handguard, the KS-4 is a lightweight, high-performance rifle engineered for duty use, defensive applications, and precision shooting.