Radical Firearms 10.5" 300 Blackout Pistol Upper HBAR M-LOK

The Radical Firearms FP10.5-300HBAR-10RPR delivers compact firepower with serious stopping capability in a 10.5-inch configuration. This complete upper receiver assembly transforms any compatible AR-15 lower into a potent 300 Blackout platform optimized for close-quarters applications. The heavy barrel profile maintains accuracy while managing heat buildup during sustained fire.

What Makes This Different

The heavy barrel (HBAR) profile sets this upper apart from standard lightweight configurations, providing enhanced accuracy and heat dissipation. Unlike thin-profile barrels that can shift point of impact under rapid fire, the heavy contour maintains consistent performance through extended shooting sessions. The 10.5-inch length strikes the optimal balance between maneuverability and ballistic performance for 300 Blackout ammunition.

Key Features

• 10.5-inch heavy barrel profile for enhanced accuracy and heat management
• 300 Blackout chambering optimized for subsonic and supersonic ammunition
• M-LOK compatible handguard with multiple attachment points
• Complete upper receiver assembly ready for installation
• Carbine-length gas system for reliable cycling
• Standard AR-15 barrel extension for universal compatibility
• Mil-spec upper receiver with T-marks for optic mounting

This upper excels in tactical applications where compact size and immediate stopping power matter most. The 300 Blackout cartridge delivers rifle-level performance from the short barrel, making it effective for home defense, patrol work, and hunting at moderate ranges. The heavy barrel profile maintains sub-2 MOA accuracy potential while managing the thermal stress of rapid follow-up shots.

Technical Specs

• Barrel Length: 10.5 inches
• Caliber: 300 AAC Blackout
• Barrel Profile: Heavy (HBAR)
• Gas System: Carbine length
• Handguard: M-LOK compatible
• Upper Receiver: Mil-spec forged aluminum
• Thread Pitch: 5/8x24 TPI
• Overall Length: Approximately 26 inches
• Weight: Approximately 3.2 pounds

This upper receiver assembly represents proven engineering focused on reliability and performance rather than unnecessary features. The heavy barrel profile and quality construction ensure consistent accuracy while the compact length provides the maneuverability demanded in close-quarters situations.