Pro2A Tactical 10.5" 300 Blackout Pistol Length Melonite M-LOK AR-15 Upper

Build an exceptionally reliable, hard-hitting defense platform with the Pro2A Tactical 10.5" 300 Blackout Pistol Length Melonite M-LOK Upper. Offering the perfect blend of increased muzzle velocity and close-quarters maneuverability, this complete upper receiver is available with high-performance 1:7 or ultra-fast 1:5 twist rate options to deliver optimal stabilization for any ammo choice. Paired with a smooth-cycling pistol-length gas system and encased in a rugged, free-float M-LOK handguard, this premium upper assembly ensures elite accuracy and modular customization. It is an outstanding foundation for your next custom AR pistol, short-barreled rifle (SBR), or dedicated home defense setup.

Key Features & Technical Specifications

• Caliber: .300 AAC Blackout (Engineered for flawless translation between heavy subsonic and fast supersonic ammunition)
• Barrel Length: 10.5 Inches (Maximizes ballistic velocity while keeping a short, tight profile)
• Gas System: Pistol-Length (Ensures consistent pressure dwell time and crisp cycling across all ammo types)
• Barrel Twist Rate Options: 1:7 Twist (great all-around stabilization) or 1:5 Fast-Twist (optimized for stabilizing heavy subsonic projectiles out of shorter barrels)
• Barrel Profile & Finish: 4150 Chrome moly vanadium Medium Profile with Premium Melonite liquid nitriding for exceptional wear resistance, reduced friction & elite rust prevention
• Handguard: 9 inch Slim, Free-Float M-LOK rail system with a continuous top Picatinny rail for your choice of optics, lights, and lasers
• Muzzle Thread: 5/8x24 TPI A2 Flash Hider 
• Receiver: Hard coat anodized black Mil-Spec forged 7075-T6 aluminum upper receiver with precision-machined M4 feed ramps, forward assist and ejection port cover
• Platform Compatibility: Pins directly onto any standard mil-spec AR-15 lower receiver

Why Choose the Pro2A Tactical 10.5" 300 Blackout Upper?

Choose Your Twist: 1:7 vs. Ultra-Fast 1:5 Ballistics

We offer this 10.5-inch platform with two specialized rifling choices to suit your shooting style. Choose the 1:7 twist rate for a highly versatile configuration that accurately drives standard supersonic hunting loads and common subsonics. Alternatively, opt for the ultra-fast 1:5 twist rate—a specification popularized by elite military personal defense weapons. The 1:5 twist spins heavy, slow subsonic projectiles immediately upon leaving the short throat, maximizing rotational stability, preventing bullet tumble, and increasing downrange energy transfer.

The 10.5-Inch Barrel Sweet Spot

While the .300 Blackout performs excellently in micro-sized packages, stepping up to a 10.5-inch barrel length yields a massive real-world advantage. This extra length grants you significantly higher muzzle velocities with supersonic loads, flattening your trajectory and extending your effective ethical hunting range, while still remaining exceptionally handy inside tight rooms, vehicles, and hallways.

Melonite Shielded Barrel Longevity

Engineered to handle harsh firing schedules, our Melonite-finished barrel utilizes an advanced QPQ liquid nitriding process. This creates an ultra-hard, friction-reducing molecular layer inside the bore and on the exterior profile. You receive the relentless corrosion resistance of traditional chrome lining without any of the uneven thickness that degrades target accuracy.

Rigid, Free-Float M-LOK Handguard Architecture

Isolate your barrel entirely from external shooting pressures to preserve your downrange point of impact. The lightweight, free-floating M-LOK handguard lets you clamp down on barricades or rest on shooting bags without shifting your zero. Featuring crisp M-LOK cutouts at 3, 6, and 9 o'clock, mounting tactical lights, weapon lasers, and ergonomic hand stops is completely clean and seamless.

Lifetime Warranty and Support:

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