The HM Defense 16MBUP556 MonoBloc Upper 223 Rem, 5.56x45mm NATO pairs a patented Monobloc barrel with a sleek 15" M-LOK free-float handguard to deliver a refined, accurate AR-15 upper assembly. Its 16" 4150 chrome moly match-grade barrel features an integrally machined gas block and a CNC machined muzzle brake, all finished in durable black Cerakote and mated to a 7075-T6 aluminum upper receiver with hard coat anodizing.

This complete upper is ideal for building a dependable AR-15 for range use, training, or general-purpose shooting where consistent accuracy and smooth recoil control matter. The free-floating 15" M-LOK handguard with Picatinny rail sections offers ample space for optics and accessories, while the included HMB bolt, M16 bolt carrier group, charging handle, and American Flag dust cover round out a ready-to-run package. HM Defense is known for innovative barrel technology and careful machining that emphasize reliability and precision.

Key Features:

• Manufacturer: LUXUS ARMS (HM DEFENSE)
• Model: MonoBloc 16MBUP556 Upper
• Caliber: .223 Remington / 5.56x45mm NATO
• Action: 223 Rem/5.56 NATO Upper Assembly
• Barrel Length: 16"
• Twist Rate: 1:8"
• Barrel Description: 4150 Chrome Moly Match Grade Monobloc With Integrally Machined Gas Block
• Barrel Finish: Black Cerakote
• Receiver Finish: Black Hard Coat Anodized 7075-T6 Aluminum
• Handguard: 15" Free-Float M-LOK With Picatinny Rail
• Muzzle Device: CNC Machined Muzzle Brake
• Sights: Optic Ready
• Type: Complete AR-15 Upper
• Weight: Approximately 4.6 lb