HM Defense 95MBUP556 MonoBloc Upper .223/5.56 9.50″

The HM Defense 95MBUP556 MonoBloc Upper is a complete AR-15 pistol upper built around a match-grade 4150 chrome-moly MonoBloc barrel with an integral machined patented gas block and a carbine gas system. It pairs a free-float M-LOK handguard with a 7075-T6 aluminum receiver finished for durability. The barrel is tripled-honed and button-rifled to support consistent, repeatable performance. The assembly includes a patented HMB bolt, Mil-Spec components, a charging handle, and a dust cover with an American flag.

Key Specifications

• The caliber is .223 Rem / 5.56x45mm NATO.
• The barrel length is 9.50″.
• The barrel description is 4150 Chrome Moly match-grade, tripled honed, button rifled.
• The barrel finish is Black Cerakote.
• The handguard is a 8.50″ M-LOK free-float design.
• The receiver is 7075-T6 aluminum with a hard coat black anodized finish.
• The gas system is a carbine gas system with an integral machined patented gas block.
• The rate of twist is 1:8″.
• The sights are optic ready.
• Includes patented HMB bolt, Mil-Spec components, charging handle, and dust cover.

Designed for compact AR-15 pistol platforms and short-barrel configurations, the MonoBloc upper combines match-grade barrel work, a precise gas system, and a rigid free-float handguard to deliver consistent, practical performance and accessory flexibility. Its materials and finishes are selected for durability and modularity, making it a purposeful choice for shooters who demand a compact, high-quality upper assembly.