PRO2A LEFT HAND 22" 6.5 Grendel 1/8 Rifle Length Melonite M-LOK AR-15 Upper

Extended Range Ballistics Built for the Left-Handed Marksman

Push the boundaries of the small-frame AR-15 platform without standard right-hand compromises. The PRO2A Left Hand 22" 6.5 Grendel Rifle-Length Upper Receiver Assembly is engineered from the ground up for southpaw shooters who demand maximum downrange velocity and precision. Featuring a dedicated, mirrored left-eject port layout, this upper completely blocks spent casings, hot unburnt powder, and high-pressure gases from crossing a left-handed operator's face or peripheral line of sight. Built around an extended 22-inch barrel to wring every bit of kinetic energy out of the 6.5 Grendel cartridge, it delivers a flatter trajectory and superior wind resistance at extended distances. Paired with a true rifle-length gas system, this premium upper drops natively onto any Mil-Spec lower receiver to anchor a highly accurate, incredibly soft-recoiling rifle build. Proudly 100% designed, machined, and hand-assembled in the USA.

Key Features

True Left-Hand Port Architecture: Specifically mirrored receiver geometry handles the manual extraction pathway smoothly, throwing spent brass out of the left side to eliminate the facial debris and distractions right-handed receivers cause southpaws.
Maximized 22-Inch Muzzle Velocity: The extended barrel length ensures complete powder combustion, driving heavier 6.5 Grendel projectiles to their optimal factory velocities to stretch out ethical hunting distances and optimize ballistic performance past 800 yards.
Melonite/Nitride Barrel Treatment: The heavy-duty 4150 CMV steel barrel is fully Melonite treated inside and out. This premium chemical hardening vastly extends barrel life, optimizes heat dissipation during long strings, and shrugs off harsh outdoor elements.
Smooth Rifle-Length Gas Dwell: Tuning a 22-inch barrel with a true rifle-length gas tube significantly lowers port pressure and slows the bolt carrier cycle. The results are an exceptionally soft recoil pulse, reduced parts fatigue, and effortless sight-picture tracking.
15-Inch Free-Float M-LOK Handguard: Built from rigid 6061-T6 aluminum, the slim free-float rail isolates barrel harmonic stress to lock in uniform mechanical accuracy while offering expansive real estate for bipods, lights, and an uninterrupted top Picatinny configuration.

Technical Specifications

Receiver	Dedicated Left Hand (Left Eject), Billet Aluminum, M4 Feed Ramps, Type III Hardcoat Anodized Black
Barrel Length & Profile	22 Inch Profile, 4150 Chrome Moly Vanadium Steel, Medium-Heavy Contour
Caliber	6.5 Grendel Type II (.136" Bolt Face Depth)
Twist Rate	1:8 Twist (Optimized to stabilize common 120gr to 130gr precision projectiles)
Gas Operating Block	Rifle-Length System, Low-Profile Gas Block Machined from 4140 Steel, Stainless Steel Gas Tube
Muzzle Device	Standard 5/8-24 Thread Pitch, A2 Flash Hider with Crush Washer
Handguard	15" 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 Medium-to-Long Range Competitors

Marksmen looking to compete with an inherently precise cartridge on an affordable small-frame layout select this 22-inch 6.5 Grendel setup. It provides ballistic performance that rivals larger calibers while remaining pleasant to shoot over long tournament strings.

Left-Handed Big-Game & Predator Hunters

Deer, hog, and open-country predator hunters who need ethical energy drop-offs past 300 yards rely on the 22-inch configuration. The mirror-ejection layout ensures that quick follow-up shots are taken without hot brass or heavy smoke getting blown into the shooter's eyes.

Suppressed Southpaw Precision Builders

Left-hand shooters assembling a precision build meant to carry a silencer benefit heavily from a dedicated left-eject port. Paired with a rifle-length gas tube, it redirects the increased backpressure completely away from the shooter's breathing space.