The LWRCI ICDI .300 Blackout 16? Direct Impingement M-LOK Patriot Brown Upper is a factory AR-15-pattern upper receiver built to chamber the versatile .300 AAC Blackout cartridge. It features a cold-hammer-forged 16.1-inch barrel with a 1:7? twist rate and 5/8?-24 TPI threaded muzzle, finished in Patriot Brown Cerakote for corrosion resistance and a distinctive field-ready look. Equipped with a free-float M-LOK handguard for modular accessory mounting and utilizing LWRCI’s Direct Impingement system with keyless bolt carrier design, this upper is designed to mate with any standard mil-spec AR-15 lower for custom rifle builds. The Patriot Brown finish and quality LWRCI construction make it a solid choice for hunting, range shooting, or tactical applications where .300 Blackout performance is desired. LWRC International LWRCI ICDI .300 Blackout 16" Bbl Direct Impingement M-LOK Patriot Brown Upper ICDIU3PBC16ML