HM Defense HM50B2 Gen 2 .50 BMG Upper Receiver 29.25" Barrel Black

The HM Defense HM50B2 Gen 2 transforms AR-15 platforms into precision .50 BMG systems without requiring a complete rifle replacement. This upper receiver assembly delivers long-range capability through a 29.25-inch barrel optimized for maximum velocity retention. Built for serious shooters demanding authentic .50 caliber performance in a familiar operating system.

What Makes This Different

Unlike bolt-action alternatives, the HM50B2 maintains semi-automatic operation while handling full-power .50 BMG cartridges. The extended 29.25-inch barrel generates higher muzzle velocities compared to shorter configurations, translating to flatter trajectories and increased effective range. Advanced recoil mitigation systems reduce felt recoil to manageable levels despite the cartridge's substantial energy output.

Key Features

• Semi-automatic .50 BMG operation on standard AR-15 lower receivers
• 29.25-inch heavy profile barrel with 1:15 twist rate for optimal bullet stabilization
• 10-round detachable magazine capacity for extended shooting sessions
• Integrated muzzle brake reduces recoil and muzzle rise significantly
• MIL-STD-1913 Picatinny rail system accommodates heavy-duty optics
• Hardcoat anodized black finish resists corrosion and wear
• Compatible with standard AR-15 trigger groups and safety selectors

Field performance centers on consistent sub-MOA accuracy potential when paired with quality ammunition and optics. The system excels in long-range precision applications including extreme distance target shooting and specialized hunting scenarios. Weather-sealed components maintain reliability across temperature extremes, while the robust construction handles the substantial pressures generated by .50 BMG cartridges.

Technical Specs

• Caliber: .50 BMG
• Barrel Length: 29.25 inches
• Magazine Capacity: 10 rounds
• Twist Rate: 1:15 right-hand twist
• Overall Length: Approximately 35 inches
• Weight: Approximately 18-20 pounds (upper assembly)
• Finish: Hardcoat anodized black
• Rail System: MIL-STD-1913 Picatinny
• Compatibility: Standard AR-15 lower receivers
• Country of Origin: United States

This upper receiver represents a significant investment in long-range capability without the expense of a dedicated .50 BMG rifle platform. Current production models feature enhanced manufacturing tolerances and improved component integration over first-generation designs. Availability remains limited due to specialized manufacturing requirements and growing demand among precision shooting enthusiasts.