The HM Defense MonoBloc Upper 16MBUP556 combines a 16″ 4150 Chromoly match-grade barrel with an integral machined patented gas block and carbine gas system. The barrel is triple honed and button rifled for precision performance in 223 Rem and 5.56x45mm NATO.
Built around a 7075-T6 aluminum receiver with hard coat anodized finish, the upper houses a 15″ M-LOK free-float handguard machined from 6061-T6 aluminum. The handguard features Picatinny rail integration and delivers a solid mounting platform for optics and accessories.
The MonoBloc Upper comes equipped with a patented HMB bolt, Mil-Spec components, charging handle, and dust cover with an American Flag. All components work together to provide a reliable AR-15 upper assembly built on proven engineering standards.
