1. Barrel :
The HM MONOBLOC upper includes an integrally machined patented gas block. Chambered in 5.56 NATO/223 Rem, the 4150 Chromoly barrel is 16 inches in length, features a 1:8 twist ratio and a mid-length gas system. All HM Defense barrels are match grade, tripled honed and button rifled for superior accuracy.
The custom HM Defense 10 3/8 inch, free float 1913 Picatinny rail is CNC machined from 6061-T6 aircraft grade aluminum. The rail is compatible with Magpul M-LOK mounting system.
3. Upper Receiver:
HM Monobloc upper features a Mil-Spec Forged 7075- T6 M4 Upper Receiver with Type III Class II hard-coat black anodized finish, M4 Feed Ramps, and a 1913 Picatinny rail flattop.
HM Defense Monobloc upper includes an M16 bolt carrier group with patented HMB bolt and Mil-Spec components and charging handle. Includes dust cover engraved with American flag.
5. Muzzel Brake:
HM Defense Monobloc upper includes CNC machined muzzle brake.
6. Barrel Finish:
Rifle Black Cerakote finish.
7. Weight: 4lb 3oz