PRO2A 12.5" 8.6 Blackout 1/3 Pistol Length Melonite M-LOK AR-10 Upper

Product Overview

The Pro2A 12.5" 8.6 Blackout Pistol Length Upper Receiver delivers an advanced hard-hitting upgrade that perfectly balances compact maneuverability with optimized ballistic velocity for large-frame weapon configurations. Chambered in the powerful 8.6 Blackout (8.6x43mm), this premium upper utilizes a hyper-fast 1:3 twist rate matrix to fully stabilize heavy subsonic or high-velocity supersonic projectiles. Built to withstand rugged environments, this modular configuration eliminates long-range build complexities by packing massive, hard-hitting energy into a versatile mid-length footprint.

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

Hyper-Fast 1:3 Ultra-Fast Twist: Delivers critical rotational energy to stabilize massive, high-grain hunting projectiles, preventing baffle strikes and ensuring immediate energy transfer.
Optimized 12.5" Profile: Provides the perfect sweet spot for maximizing muzzle velocity and powder burn efficiency while remaining significantly more compact than full-sized platforms.
DPMS High Profile Modularity: Machined to exact high-profile specifications to ensure flawless integration and smooth lock-up onto matching standard large-frame lower frames. (Read Caution Above)
Corrosion-Resistant Finish: The premium Melonite treated bore and exterior surfaces maximize lifecycle reliability and performance under harsh outdoor conditions.

Technical Specifications

Upper Receiver	LR-308 / AR-10 Format, DPMS High Profile Specification, Forged 7075-T6 Aluminum, Hardcoat Anodized Black (Forward Assist & Dust Cover Pre-Installed)
Barrel Length & Profile	12.5-Inch Medium Duty Contour
Caliber	8.6 Blackout (8.6x43mm)
Twist Rate	1:3 Ultra-Fast Twist
Barrel Material & Treatment	4150 Chrome Moly Vanadium Steel, Premium Corrosion-Resistant Melonite Finish
Gas Operating Block	Pistol Length Direct Impingement, Low-Profile Steel Gas Block, Stainless Steel Gas Tube
Muzzle Thread & Device	5/8-24 Thread Pitch, A2 Style Flash Hider with Crush Washer
Handguard Rail	10" Slim Free-Float M-LOK Handguard, Machined from 6061-T6 Aluminum with Top Picatinny Rail Layout
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 12.5-inch 8.6 Blackout build. It delivers hard-hitting terminal energy out of a well-balanced, fast-handling pistol or SBR 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.