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TacFire BU30010 300 Blackout 10 Upper Receiver Assembly MLOK Handguard Black UPC 729205508325
Product Description
The TacFire® 10" .300 AAC Blackout Complete Upper Receiver Assembly (SKU: BU30010 / UPC: 729205508325) delivers an uncompromising, mission-ready front-end solution engineered specifically for compact PDW, truck gun, and tactical AR pistol configurations. Purpose-built around the versatile .300 Blackout cartridge, this assembly optimizes dwell time and powder burn out of a compact 10-inch barrel profile, ensuring clean cycling across both heavy subsonics and high-velocity barrier-blind supersonics when paired with standard carbine buffer setups or dedicated suppressor systems.
Forged from aerospace-grade 7075-T6 aluminum, the flat-top upper receiver is hardcoat anodized to MIL-A-8625 Type III Class 2 specifications, defending the internal raceways against cyclic abrasive wear, harsh carbon fouling, and solvent exposure. At its core, the 10-inch barrel is precision machined from premium 4150 Chrome Moly Vanadium (CMV) steel and treated inside and out with a Salt Bath Nitride / QPQ Melonite finish. This surface conversion creates exceptional micro-hardness and superior corrosion resistance compared to standard phosphate. The 1:8" twist rate delivers precise ballistic stabilization across the full spectrum of projectile weights, while the 5/8x24 thread pitch accepts standard direct-thread or quick-detach suppressor mounts and muzzle brakes.
Surrounding the barrel is a lightweight, free-floating 6061-T6 aluminum handguard utilizing an intuitive M-LOK® interface along the 3, 6, and 9 o'clock positions. The free-float design eliminates barrel deflection under barricade support or sling tension, preserving mechanical accuracy downrange. A full-length Mil-Spec 1913 Picatinny top rail seamlessly integrates with the receiver flat-top, providing rigid, uninterrupted plane alignment for red dots, holographic sights, magnifiers, and thermal optics.
*Armorer Bench Notes & Real-World Staging Guidance:*
Fitment Matrix: Direct fit for Mil-Spec standard-pattern AR-15 lower receivers. CRITICAL: Barrel length is 10 inches. Ensure legal compliance by installing strictly on AR pistol lowers or registered NFA SBR lower receivers. Standard 5/8x24 TPI muzzle threads; torque all suppressor mounts or replacement muzzle devices to 20–25 ft-lbs using appropriate shims (avoid crush washers with silencers to prevent baffle strikes). BCG and charging handle are not included.
- Ensure the host firearm lower receiver is completely clear, magazine removed, and chamber visually and physically verified empty prior to handling.
- Inspect the upper assembly's M4 feed ramps and barrel extension for cleanliness, lubricate the interior receiver raceways with high-grade synthetic weapon oil, and insert a verified Mil-Spec AR-15 Bolt Carrier Group (BCG) and charging handle.
- Align the front pivot pin lug with your lower receiver's front pin and push the pivot pin fully into place, then swing the upper down into the rear takedown pocket.
- Depress the rear takedown pin fully into the locked position; check the handguard clamping screws (recommended 35–40 in-lbs) and muzzle device retention before mounting accessories.
- Cycle the action manually several times to verify smooth carrier movement, confirm bolt lock-back on an empty magazine, and perform a complete dry-fire trigger and safety function check before live-fire staging.
Key Features
- 4150 CMV Nitride Barrel: Salt Bath Nitride (QPQ) treated 10" barrel resists heat erosion, bore wear, and extreme environmental exposure.
- Optimized 1:8" Twist: Precision button rifling stabilizes heavy 220gr subsonic loads as well as light 110gr supersonic tactical ammunition.
- Free-Float M-LOK® Rail: Rigid 6061-T6 handguard reduces barrel stress while offering modular mounting slots for lights, grips, and switches.
- Pistol-Length Gas System: Ensures high reliability, consistent gas port pressure, and positive extraction with or without a sound suppressor.
- Forged 7075-T6 Receiver: Mil-Spec forged receiver includes forward assist, dust cover assembly, and M4 feed ramps for feeding reliability.
- Standard 5/8x24 Thread Pitch: Ready out of the box for popular .30-caliber muzzle brakes, flash hiders, or quick-detach suppressor adapters.
Product Specifications
- Brand: TacFire®
- Model/Series: 10" .300 Blackout Complete Upper Receiver Assembly
- MPN / SKU: BU30010 / BU-300-10
- UPC: 729205508325
- Caliber: .300 AAC Blackout (7.62x35mm)
- Barrel Length: 10.0 Inches
- Barrel Material: 4150 Chrome Moly Vanadium (CMV) Steel
- Barrel Finish: Salt Bath Nitride / QPQ Melonite
- Barrel Twist Rate: 1:8"
- Muzzle Thread Pitch: 5/8x24 TPI
- Gas System Length: Pistol-Length (.750" Gas Block Journal)
- Receiver Material: Forged 7075-T6 Aluminum
- Receiver Finish: MIL-A-8625 Type III Class 2 Hardcoat Anodized
- Handguard: Free-Float Slim M-LOK® 6061-T6 Aluminum
- Platform Compatibility: Standard Mil-Spec AR-15 Lower Receivers
- Country of Origin: USA / Imported Components
