PRO2A 16" 8.6 Blackout 1/3 Carbine Length Melonite M-LOK AR-10 Upper

Harness Unmatched Big-Bore Rotational Energy and Subsonic Dominance

Step into the next evolution of large-frame direct impingement performance with the PRO2A 16" 8.6 Blackout Carbine Length Melonite M-LOK AR-10 Upper Receiver. Engineered explicitly around the cutting-edge 8.6 Blackout cartridge, this complete factory-assembled upper utilizes an incredible, ultra-fast 1:3 twist rate barrel. This hyper-spin rifling turns heavy supersonic and massive subsonic projectiles into stabilization masterpieces, yielding catastrophic downrange energy dispersion. Designed to mount seamlessly onto any DPMS high-profile format LR-308 / AR-10 lower receiver, this upper drops in to provide hard-hitting hunting viability and silent barrier-blind dominance without federal SBR tax restrictions. Proudly 100% designed, machined, and precision-assembled in the USA.

NOTE: MUST BE PAIRED with our Pro2A Tactical Stripped or Complete AR-10 Lower Receivers for seemless compatibility and trouble free fitment. As there is NO milspec standard for the AR-10 Platform, we do not guarantee fitment with other manufacturer's AR-10 Lower Receivers.

Key Features

Ultra-Fast 1:3 Twist Hyper-Spin: Specifically engineered to capitalize on the unique rotational mechanics of the 8.6 Blackout round. The radical 1:3 twist spin-stabilizes heavy-grain subsonic defensive loads and solid copper hunting bullets with surgical precision, accelerating mechanical tissue damage on impact.
Melonite/QPQ Hardened Bore Integrity: The heavy-duty 4150 CMV steel big-bore barrel undergoes a complete premium Nitride/Melonite surface conversion treatment. This process locks in superior wear resistance against aggressive gas erosion, minimizes friction coefficients, and repels rust under extreme environmental exposure.
Reliable Carbine-Length Gas Velocity: Optimized with a low-profile steel gas block and carbine gas architecture to confidently tune cycling pressures. This setup ensures crisp gas routing for clean bolt extraction paths, whether firing unsuppressed or suppressed configurations.
15-Inch Rigid Free-Float Handguard: Machined from tough 6061-T6 aluminum, the slim free-float modular rail protects barrel harmonics from external support pressure while supplying expansive mounting tracks for M-LOK bipods, thermal scopes, and infrared designators.

Technical Specifications

Upper Receiver	LR-308 / AR-10 Format, DPMS Low Profile Specification, Billet 7075-T6 Aluminum, Hardcoat Anodized Black (Forward Assist & Dust Cover Pre-Installed)
Barrel Length & Profile	16 Inch Profile, 4150 Chrome Moly Vanadium Steel, Medium Profile, Melonite Treated Finish
Caliber	8.6 Blackout (8.6x43mm)
Twist Rate	1:3 Ultra-Fast Twist
Gas Operating Block	Carbine Length Direct Impingement, 0.750" Low-Profile Gas Block Machined from Steel, Stainless Steel Gas Tube
Muzzle Thread & Device	5/8-24 Thread Pitch, A2 Style Flash Hider with Crush Washer
Handguard	15" Slim Competition Top Free-Float M-LOK Rail, Type III Hardcoat Anodized 6061-T6 Aluminum
Manufacturing Origin	100% Made in the USA with Pro2A Tactical Lifetime Factory Warranty

Who Chooses This Upper Receiver?

Big-Bore Hunting Operators

Hunters who target large hogs, deer, or bear in dense timber landscapes rely on this 16-inch 8.6 Blackout build. It delivers hard-hitting terminal energy matching a .338 Federal out of a shorter, non-NFA legal rifle frame.

Tactical Suppression Marksmen

Shooters tracking silent operations select this hyper-spin 1:3 layout to leverage subsonic ammunition. The fast twist stabilizes heavy projectiles perfectly, avoiding baffle strikes while creating devastating close-to-medium range performance.

AR-10 Builders Demanding Drop-In Modularity

Custom gunsmiths aiming to update a standard large-frame lower into an innovative, heavy-hitting utility weapon choose this complete upper. It snaps easily onto DPMS high-profile frames, bypassing home assembly risks.