Pro2A Tactical 8.5" 300 Blackout Pistol Length Melonite M-LOK AR-15 Upper

Build the ultimate high-performance personal defense weapon with the Pro2A Tactical 8.5" 300 Blackout Pistol Length Melonite M-LOK Upper. Widely considered the ideal length for the .300 AAC Blackout cartridge, this complete upper receiver features a premium 8.5-inch Melonite barrel with a fast 1:7 twist rate to effortlessly stabilize heavy subsonic rounds and fast supersonic loads alike. Tuned with a highly reliable pistol-length gas system and wrapped in a rigid, free-float M-LOK handguard, this upper provides maximum modularity and hard-hitting tactical capability. It is the perfect choice for custom AR pistol builds, registered SBRs, and discrete home defense setups.

Key Features & Technical Specifications

• Caliber: .300 AAC Blackout
• Barrel Length: 8.5 Inches (The ballistic sweet spot for complete powder burn and compact handling)
• Gas System: Pistol-Length (Engineered to ensure flawless cycling and optimal pressure control)
• Barrel Twist Rate: 1:7 Twist (Optimized to accurately stabilize heavy subsonic defensive rounds and lighter supersonic ammo)
• Barrel Profile: Medium Profile for best weight vs performance ratio
• Barrel Finish: 4150 Chrome moly vanadium Premium Melonite (QPQ) liquid nitriding for extreme wear resistance, slick action, and elite corrosion defense
• Handguard: 7 inch Slim, Free-Float M-LOK rail system with a continuous top Picatinny rail for your choice of optics and accessories
• Muzzle Thread: 5/8x24 TPI A2 Flash Hider
• Receiver Material: Hard coat anodized black Mil-Spec forged 7075-T6 aluminum upper receiver with precision-machined M4 feed ramps - comes with forward assist and ejection port cover
• Platform Compatibility: Fits perfectly onto any standard mil-spec AR-15 lower receiver

Why Choose the Pro2A Tactical 8.5" 300 Blackout Upper?

The Ballistic Sweet Spot for .300 Blackout

Unlike 5.56 NATO which requires a long barrel to burn its powder, the .300 AAC Blackout cartridge was explicitly designed to achieve full powder burn and maximum velocity in an 8-to-9-inch barrel profile. An 8.5-inch barrel length gives you near-maximum terminal ballistics and devastating close-range energy while maintaining a highly maneuverable, ultra-compact footprint that excels inside vehicles and tight corridors.

Melonite Shielded Barrel Longevity

Engineered to withstand rigorous firing schedules, our Melonite-finished barrel utilizes an advanced QPQ liquid nitriding process. This treatment creates an ultra-hard surface layer both inside the bore and on the exterior profile. The result is superior protection against heat, friction, and moisture, giving you traditional chrome-lined durability without sacrificing match-grade accuracy.

Rigid, Modular Free-Float M-LOK Handguard

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.

Mil-Spec Forged Dependability

Every single component in this upper assembly is crafted from top-tier materials. The receiver itself is forged from rugged 7075-T6 aluminum and features precision-machined M4 feed ramps to guarantee ultra-smooth feeding and extraction right out of the box. Simply add your preferred Bolt Carrier Group (BCG), charging handle, and muzzle device to deploy a professional-grade weapon system.

Lifetime Warranty and Support:

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