Brownells XB2 Speed ODG .300 Blackout Upper Receiver Assembly

The Brownells XB2 Speed ODG upper receiver assembly in .300 Blackout delivers enhanced performance for tactical applications and sport shooting. This complete upper features OD Green finish and specialized components engineered for reliable cycling with both subsonic and supersonic .300 Blackout ammunition.

What Makes This Different

The XB2 Speed configuration incorporates optimized gas system timing and enhanced bolt carrier group components that ensure consistent cycling across the full spectrum of .300 Blackout loads. Unlike standard AR-15 uppers that may struggle with lighter subsonic rounds, this assembly maintains reliable function from 110-grain to 220-grain projectiles. The OD Green Cerakote finish provides superior corrosion resistance compared to standard phosphate coatings.

Key Features

• Complete upper receiver assembly chambered in .300 Blackout
• OD Green Cerakote finish for enhanced durability and corrosion resistance
• Optimized gas system for reliable cycling with subsonic and supersonic loads
• Enhanced bolt carrier group with improved materials and coatings
• Standard AR-15 compatibility with mil-spec lower receivers
• M-LOK compatible handguard for accessory mounting
• Chrome-lined barrel for extended service life

Field performance demonstrates consistent accuracy and reliability across various ammunition weights and environmental conditions. The .300 Blackout chambering excels in close-quarters applications, suppressed shooting, and hunting scenarios where terminal performance matters more than long-range capability. Weather-sealed components maintain function in adverse conditions, while the robust construction handles high round counts without degradation.

Technical Specs

• Caliber: .300 AAC Blackout
• Barrel Length: 16 inches (estimated)
• Twist Rate: 1:7 or 1:8 (optimized for heavy bullets)
• Finish: OD Green Cerakote
• Gas System: Carbine or Mid-length
• Thread Pitch: 5/8x24 TPI
• Overall Weight: Approximately 3.5-4.5 lbs
• Compatibility: Standard AR-15 lower receivers

This upper receiver assembly represents a purpose-built solution for shooters requiring reliable .300 Blackout performance. The combination of enhanced components and proven design delivers consistent results whether used for tactical applications or recreational shooting.