PRO2A 12.5" 300 Blackout Pistol Length Melonite AR-15 Upper with Flash Can Kit

All-In-One High-Velocity PDW Assembly with Linear Blast Direction

Maximize the full ballistic efficiency and handling potential of the 300 AAC Blackout cartridge. The PRO2A 12.5" 300 Blackout Pistol Length Melonite Upper with Flash Can Kit is a comprehensive, range-ready build solution that bundles a complete upper assembly, a premium Mil-Spec bolt carrier group (BCG), and a standard charging handle. Built around a versatile 12.5-inch barrel configuration, this kit provides extra velocity scaling over micro setups, maximizing powder burn for supersonic loads while remaining exceptionally reliable with sub-sonic ammo. Equipped with a pre-installed slimline tactical flash can, it safely redirects intense short-barrel gas concussion and muzzle blast straight downrange away from the shooter. Drops natively onto any standard Mil-Spec lower receiver. Proudly 100% designed, machined, and precision-assembled in the USA.

Key Features

Complete Drop-In Integration Kit: Eliminates the hassle of headspacing and sourcing separate components. This kit ships complete with a matching premium bolt carrier group (BCG) and standard charging handle, ensuring seamless cycling right out of the box. Comes with everything needed to complete a stripped lower receiver.
Custom Slimline Flash Can: Pre-installed on the muzzle to tame the aggressive blast pressures common to short-barrel builds. It acts as a linear forward-director, pushing noise, concussion, and flash downrange to protect the shooter and lane partners.
Optimized 12.5-Inch Barrel Profile: Bridges the gap between micro footprints and full-size rifles, offering extra dwell time and higher muzzle velocity parameters for both hunting and defensive ammunition.
Melonite/Nitride Barrel Protection: The heavy-duty 4150 CMV steel barrel is fully Nitride/Melonite treated inside and out. This premium chemical hardening vastly extends barrel life against intense thermal wear and delivers excellent corrosion resistance.
Slim Profile Free-Float M-LOK Rail: Built from durable 6061-T6 aluminum, the free-float handguard completely isolates barrel vibrations to preserve uniform mechanical accuracy while offering extensive M-LOK attachment slots and a continuous top Picatinny rail.

Technical Specifications

Upper Receiver	Mil-Spec Forged 7075-T6 Aluminum, M4 Feed Ramps, Type III Hardcoat Anodized Black Finish (Forward Assist & Dust Cover Installed)
Bolt Carrier Group	Premium M16 Profile Mil-Spec BCG, Nitride Finish, Bolt Magnetic Particle Inspected (MPI)
Charging Handle	Standard Mil-Spec Aluminum Charging Handle
Barrel Length & Steel	12.5 Inch Medium Profile, 4150 Chrome Moly Vanadium Steel, Melonite Treated
Caliber	300 AAC Blackout (300 BLK)
Twist Rate	1:8 Twist (All-around stabilization for supersonic and heavy sub-sonic ammo)
Gas Operating Block	Pistol-Length System, Low-Profile Gas Block Machined from 4140 Steel, Stainless Steel Gas Tube
Muzzle Device	Standard 300 BLK Thread Pitch (5/8-24 Threads), Pre-Installed Slimline Linear Flash Can
Handguard	15 Inch Slim Profile Free-Float M-LOK Handguard, Extended Profile Partially Tucking the Muzzle Device, Machined from 6061-T6 Aluminum
Lower Parts	Milspec Polished Trigger & Hammer, Standard Grip & Milspec Lower Parts Kit
Brace	Standard Blade with pistol buffer tube, 3oz buffer, buffer spring, latch plate and castle nut
Manufacturing Origin	100% Made in the USA with Pro2A Tactical Lifetime Factory Warranty

Who Chooses This Upper Receiver Kit?

Tactical Indoor & Close-Quarters Shooters

Operators training inside confined environments or indoor lanes select this flash-can-equipped upper kit. It channels the aggressive acoustic concussion of the short barrel completely forward, eliminating uncomfortable side-blast concussion feedback.

Thick Brush & Whitetail Tree Stand Hunters

Hunters tracking medium-sized game in dense woods value the nimble 12.5-inch profile. The configuration allows for quick weapon swinging in tight blinds while the 300 BLK cartridge punches cleanly through light brush with authoritative terminal energy.

Home Defense Custom Builders Wanting a Total Kit

Enthusiasts building a dependable personal defense weapon prefer the simplicity of an all-inclusive kit. Bypassing the mechanical headache of headspacing raw bolts or matching individual gas keys, it provides an American-made, ready-to-pin factory package.