Daniel Defense MK18 10.3" 5.56 NATO Carbine-Length Upper, Black

The MK18 Upper Receiver Group 5.56 NATO from Daniel Defense is a compact, high-performance AR-15 upper designed for reliability, durability, and close-quarters effectiveness. Chambered in 223 Remington and 5.56 NATO, this upper assembly features a 10.3 inch barrel configuration optimized for maneuverability while maintaining consistent ballistic performance. Built to military-grade standards, the MK18 platform is widely recognized for its proven performance in demanding environments.Constructed with a precision-machined upper receiver and a rugged free-float quad rail handguard, the MK18 provides a stable platform for mounting optics, lights, and other accessories. The design supports reliable cycling and long-term durability, making it well suited for tactical applications, training, and range use. Compatible with standard AR-15 lower receivers, this 5.56 NATO upper receiver group delivers a dependable and compact solution for building or upgrading an AR-15 platform.