HM Defense MONOBLOC 16 Inch Complete 5.56 AR-15 Upper Receiver with 10 Inch M-LOK Handguard
Cost-Effective Complete Upper Receiver for A High-Performance AR-15 Build
This HM Defense BUP Complete Upper Receiver features a 16-inch 4150 Chromoly barrel with an patented integrally machined gas block, and a carbine gas system. HM Defense has developed a revolutionary gas block that is actually part of the barrel which, greatly improves the barrel harmonics for better accuracy and provides a dependable performance even in severe conditions.
Included in this complete upper is the HM Defense 10 3/8 inch Free Float Picatinny Rail Handguard machined from 6061-T6 aircraft-grade aluminum. Also included is a patented HMB bolt, a charging handle, and a dust cover with an American Flag.
This upper receiver represents a high-quality option that will allow you to complete your next AR-15 for a top-performance build.
- 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 and 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.
- Handguard: 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.
- 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.
- Components: 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 an American flag.
- Muzzle Brake: HM Defense Monobloc upper includes CNC machined muzzle brake.
- Barrel Finish: Rifle Black Cerakote finish.
- Type: Complete Upper Assembly
- Barrel Length: 16″
- Caliber: .223/5.56 NATO
- Color: Black
- Handguard: 10 3/8″ M-LOK Rail
- Finish: Anodized
- Fit: AR15
- Barrel Twist Rate: 1:8