HM Defense 16MBUP556L MonoBloc Upper 223 Remk, 5.56x45mm NATO 16" Black Cerakote Barrel 7075-T6 Aluminum Black Anodized Receiver, 15" M-LOK Free-Float Handguard with Long Rail for AR-15

The HM Defense 16MBUP556L MonoBloc Upper in .223 Remington / 5.56x45mm NATO is purpose-built for shooters who demand precision and reliability in a mid-length rifle platform. This complete upper assembly serves law enforcement, military, and civilian tactical operators who require a drop-in solution without the complexity of component assembly. The MonoBloc design integrates the receiver and handguard into a single rigid structure, eliminating flex and enhancing consistency shot-to-shot.

Built from 7075-T6 aluminum with black anodized finish, the receiver delivers the hardness and durability required for high-round-count duty cycles while resisting corrosion and wear. The 16-inch barrel in black Cerakote provides a balanced profile—short enough for CQB environments yet long enough to maintain velocity and accuracy at intermediate distances typical of law enforcement and defensive scenarios. The 15-inch M-LOK free-float handguard with integral long rail system enables rapid accessory mounting for lights, lasers, and optics without binding or shifting, maintaining zero retention through thousands of rounds.

This upper pairs seamlessly with any AR-15 lower receiver (5.56x45mm NATO spec), making it ideal for shooters building or upgrading existing rifles. The free-float design eliminates handguard contact with the barrel, a critical factor for sub-MOA accuracy in tactical and precision applications. Weighing 5 pounds, the upper provides a lightweight, fast-handling platform without sacrificing structural integrity—preferred by operators who must move quickly in dynamic environments. Installation requires only proper barrel extension alignment and upper receiver pin installation; no gunsmithing necessary.