PRO2A Left Hand 12.5" 350 Legend 1/16 Pistol Length Melonite M-LOK Upper with Flash Can | Pro2A Tactical

PRO2A LEFT HAND 12.5" 350 Legend 1/16 Pistol Length Melonite M-LOK AR-15 Upper with Flash Can

Maneuverable Straight-Wall Power explicitly Designed for Southpaw Sportsmen

Dominate modern hunting restrictions and close-quarters handling without typical right-hand frame compromises. The PRO2A Left Hand 12.5" 350 Legend Pistol Length Upper Receiver Assembly is engineered from the ground up for left-handed marksmen utilizing the highly efficient, straight-walled .350 Legend cartridge. Featuring a fully mirrored port layout, this upper safely isolates heavy gas blowback and expanding combustion debris out the left side—completely clearing a southpaw's line of sight. Its compact 12.5-inch barrel setup yields an exceptionally fast-handling profile that drops natively onto any Mil-Spec lower receiver configured as a legal pistol or registered SBR. Pre-equipped with a slimline tactical flash can, it pushes severe muzzle blast straight forward away from the shooter. Proudly 100% designed, machined, and hand-assembled in the USA.

Key Features

Dedicated Left-Hand Architecture: Features a fully mirrored port configuration that ejects spent casing brass cleanly out of the left side of the upper, redirecting heavy straight-wall blowback dynamics away from left-handed shooters' eyes and faces.
Optimized 1:16 Twist Rate: The 1:16 right-hand button-rifled twist pattern is mathematically tailored for standard .357-diameter hunting bullets, flawlessly stabilizing common 150-grain, 170-grain, and heavy 180-grain straight-wall hunting ammunition classes.
Melonite/Nitride Barrel Hardening: The heavy-duty 4150 CMV steel barrel is fully treated with a premium Melonite finish inside and out. This high-grade hardening process vastly extends barrel life, aids in uniform thermal dissipation, and handles corrosive outdoor exposure beautifully.
Integrated Slimline Flash Can: Pre-installed on the muzzle to manage the sharp acoustic footprint typical of a short 12.5" barrel configuration. It projects concussive force, flash, and sound directly downrange toward the target to enhance shooting lane comfort.
Free-Float Modular M-LOK Rail: Machined from rigid 6061-T6 aluminum, the slim free-float handguard completely isolates barrel stress to preserve maximum baseline accuracy while providing generous M-LOK mounting real estate.

Technical Specifications

Receiver	Dedicated Left Hand (Left Eject), Billet Aluminum, Enlarged M4 Feed Ramps, Type III Hardcoat Anodized Black
Barrel Length & Steel	12.5 Inch Medium Profile, 4150 Chrome Moly Vanadium Steel
Caliber	350 Legend
Twist Rate	1:16 Twist
Gas Operating Block	Pistol-Length System, Low-Profile Gas Block Machined from 4140 Steel, Stainless Steel Gas Tube
Muzzle Device	Standard 5/8-24 Thread Pitch Pre-Installed Slimline Forward-Directing Flash Can
Handguard	15 inch Slim Profile Free-Float M-LOK Rail, Machined from 6061-T6 Aluminum
Manufacturing Origin	100% Made in the USA with Pro2A Tactical Lifetime Factory Warranty

Who Chooses This Upper Receiver?

Southpaw Straight-Wall Whitetail Hunters

Sportsmen operating in restricted straight-wall states (such as Ohio, Michigan, Iowa, and Indiana) choose this configuration to build a lightweight, legal left-handed AR hunting pistol that keeps flying brass out of their face during critical follow-up tracking shots.

Thick Brush & Blind Woods Navigators

Hunters who spend their time in dense timber or cramped tree stands value the ultra-short 12.5-inch overall footprint. It eliminates snag hazards and allows for effortless target swinging inside tight physical blinds while retaining lethal medium-range energy drops.

Low-Recoil Big Bore Enthusiasts

Enthusiasts wanting a hard-hitting projectile without excessive cyclic kick choose the 350 Legend. The combination of its straight-walled design and soft pistol-length gas system configuration delivers low felt recoil, perfect for younger hunters or high-volume practice sessions.

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