The HM Monobloc upper includes an integrally machined patented gas block. Chambered in 5.56 Nato/223 Rem, the 4150 Chromoly barrel is 12.5" in length, features a 1:8 twist ratio and a mid-length gas system. All HM Defense barrels are match grade, triple honed and button rifled for superior accuracy.
The custom HM Defense 10 3/8", free float 1913 Picatinny rail is CNC machined from 6061-T6 aircraft grade aluminum. The rail is compatible with Magpul M-LOK mounting system.
HM Monobloc upper features a Mil-Spec Forged 7075-T6 M4 Upper Receiver with Type II Class II hard-coat black anodized finish, M4 Feed Ramps, and a 1914 Picatinny rail flat top.
The upper includes an M16 bolt carrier group with patented HMB bolt and Mil-Spec components and charging handle. Include dust cover engrved with American Flag.
Includes a CNC machined mzzule brake.