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The HM Defense 125MBUP556, otherwise known as the MonoBloc Upper, stands out for its impressive features. It sports an HM barrel that incorporates a unique, patented gas block that's machined right into it. This product also utilizes a carbine gas system for optimal functionality. Moreover, it's made of 4150 Chromoly, of match-grade quality, and boasts a tripled honed, button-rifled design.
The handguard of this tool is designed to be free-floating and employs a Picatinny rail. It incorporates Magpul M-LOK features and is constructed from sturdy 6061-T6 aluminum. Both its upper and lower receivers are crafted from robust 7075-T6 aluminum, and are protected with a hard coat anodized finish to ensure longevity.
What makes the MonoBloc Upper even more remarkable is it’s inclusive of a patented HMB bolt, various Mil-Spec components, a charging handle, and a dust cover emblazoned with an American Flag, showcasing a touch of patriotic spirit.
