Pro2A Tactical 8.5" 300 Blackout Upper with Flash Can | M-LOK AR-15

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

Build the ultimate high-performance personal defense weapon with the Pro2A Tactical 8.5" 300 Blackout Pistol Length Melonite M-LOK Upper with Flash Can. Delivering the ultimate ballistic footprint 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 flawlessly stabilize heavy subsonic rounds and fast supersonic loads. Outfitted with a highly reliable pistol-length gas system, a free-float M-LOK handguard, and a premium Flash Can blast forwarding muzzle device, this upper directs concussive energy straight downrange away from the shooter. 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 absolute ballistic sweet spot for complete powder burn in compact setups)
Gas System: Pistol-Length with low profile gas block (Engineered to ensure flawless cycling and reliable extraction pressures)
Barrel Twist Rate: 1:7 Twist (Fast spin rate critical for stabilizing heavy 200gr+ subsonic defensive projectiles)
Barrel Profile: Medium Profile for best weight vs performance ratio
Barrel Finish: 4150 Chrome moly vanadium with Premium Melonite liquid nitriding for maximum bore lifespan, slick action, and elite corrosion protection
Handguard: 9 inch Slim, Free-Float M-LOK rail system with a continuous top Picatinny rail for optics and tactical gear
Muzzle Device: Custom 5/8-24 Slimline Flash Can (Redirects high-pressure muzzle noise, blast, and concussion forward away from the shooter)
Receiver Material: 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: Fits perfectly onto any standard mil-spec AR-15 lower receiver

Why Choose the Pro2A Tactical 8.5" 300 Blackout Upper?

Peak Ballistic Performance Out of an 8.5" Barrel

Unlike 5.56 NATO which requires a long barrel to burn its powder efficiently, the .300 AAC Blackout cartridge was explicitly designed to achieve full powder burn and optimal muzzle velocity in short barrel profiles. This 8.5-inch barrel length gives you near-maximum terminal ballistics and devastating close-range energy while keeping your weapon ultra-compact, lightweight, and highly maneuverable inside tight spaces or vehicles.

Tame Compact Blast Concussion with the Flash Can

Short-barreled tactical firearms can produce harsh side concussion and bright muzzle flash. This upper solves that issue out of the box with a 5/8-24 Flash Can blast forwarding device. By capturing high-pressure expansion gases and directing the noise and concussion linear downrange, it keeps the shooting experience highly comfortable for you and neighboring shooters on the firing line.

Melonite Shielded Barrel Longevity

Engineered to handle harsh firing schedules and fluctuating temperatures, our Melonite-finished barrel utilizes an advanced QPQ liquid nitriding process. This treatment creates an ultra-hard, friction-reducing 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, Free-Float M-LOK Handguard Architecture

Isolate your barrel entirely from external shooting pressure 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 weapon lights, hand stops, and ergonomic accessories is completely clean and seamless.