HM Defense 16MBUP556 MonoBloc Upper 223 Rem, 5.56x45mm NATO 16" Black Cerakote Barrel, 7075-T6 Aluminum Black Anodized Receiver, 15" M-LOK Free-Float Handguard for AR-15

The HM Defense 16MBUP556 MonoBloc Upper represents a precision-engineered solution for AR-15 builders and tactical operators who demand reliability without compromise. Designed for both 223 Remington and 5.56x45mm NATO ammunition, this upper receiver assembly delivers the modular flexibility and performance accuracy that law enforcement and military-trained shooters expect in a modern carbine platform. The monoblock construction eliminates typical receiver gap tolerances, translating to tighter lockup and improved consistency for duty use or precision applications.

Built from 7075-T6 aluminum with black anodized finish, the receiver provides superior strength-to-weight ratio and corrosion resistance critical for field operations. The 16-inch barrel with durable black Cerakote coating balances velocity and portability—ideal for close-quarters tactical work, home defense, or transitional shooting scenarios. The 15-inch M-LOK free-float handguard isolates barrel harmonics from shooter input, enhancing accuracy and allowing ergonomic accessory mounting without affecting point of impact. Weighing only 4.7 pounds, this upper keeps total platform weight manageable while maintaining the structural integrity demanded by high-round-count training cycles.

This upper assembly suits armorer-level builders, law enforcement agencies upgrading duty rifles, and civilian shooters seeking a battle-ready foundation for precision or defensive use. The monoblock design and free-float tube work in concert to support sub-MOA performance when properly matched with quality lower receivers and ammunition. Installation requires standard AR-15 receiver tools; compatibility is universal across mil-spec lower receivers, making this a plug-and-play solution for complete builds or platform upgrades.