PRO2A Left Hand 16" 5.56 NATO 1/7 Melonite M-LOK Upper | Pro2A Tactical

PRO2A LEFT HAND 16" 5.56 NATO 1/7 Melonite M-LOK AR-15 Upper

Rifle-Length Compliance and Flawless Left-Side Ejection for Southpaw Shooters

Ditch the standard right-hand configuration compromises and keep hot brass, burning powder, and escaping gases out of your peripheral line of sight. The PRO2A Left Hand 16" 5.56 NATO Melonite M-LOK Upper Receiver Assembly is engineered from the ground up to support the ergonomics and performance left-handed operators require. Cut to a standard, non-NFA compliance-friendly 16-inch profile, this complete upper receiver handles a robust gas operating pathway while offering the mechanical reliability of a mirrored port design. Drops natively onto any standard left-handed or ambidextrous Mil-Spec lower receiver. Proudly 100% designed, machined, and hand-assembled in the USA.

Key Features

True Left-Hand Port Architecture: Specifically mirrored receiver geometry handles the extraction pathway smoothly, throwing spent brass out of the left side to eliminate the facial debris and distractions right-handed receivers cause southpaws.
Melonite 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 high-velocity pressure spikes, aids thermal dissipation, and handles harsh field elements much better than traditional chrome lining.
Aggressive 1:7 Twist Rate Profile: Specifically button-rifled with a fast 1:7 twist profile to perfectly stabilize heavy duty, tactical, and military-grade projectiles—such as 62-grain and 77-grain match choices—maintaining mechanical consistency.
12-Inch Premium Free-Float 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 target optics.

Technical Specifications

Receiver	Dedicated Left Hand (Left Eject), Billet Aluminum, M4 Feed Ramps, Type III Hardcoat Anodized Black
Barrel Length & Steel	16 Inch Profile, 4150 Chrome Moly Vanadium Steel, Medium Profile Contour, Melonite Treated
Caliber	5.56 NATO (Fully backward compatible with .223 Remington ammunition)
Twist Rate	1:7 Twist (Optimized to stabilize heavy duty 62gr and heavy 77gr duty ammo)
Gas Operating Block	Low-Profile Gas Block Machined from 4140 Steel, Stainless Steel Gas Tube
Muzzle Device	Standard 1/2-28 Thread Pitch, A2 Flash Hider with Crush Washer
Handguard	12" 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?

Left-Handed Operational Shooters

Southpaw marksmen tired of compromising on standard right-handed rifles choose this dedicated left-eject setup to keep escaping gas, burning powder residue, and hot brass completely out of their peripheral line of sight.

General Purpose No-NFA Carbine Builders

Shooters wanting a general-use tactical tool choose the 16-inch length to achieve full rifle velocity metrics and zero registration or NFA tax stamp requirements, maintaining standard modular utility.

Suppressed Southpaw Builders

Left-hand shooters planning to host a suppressor benefit heavily from a left-hand port layout. Suppressors drastically increase backpressure, and a left-ejecting receiver prevents that concentrated gas from venting directly into the shooter's face.

More Information

More Information
SKU	P2AL556GFS1216-TK
Barrel Length	16 inch
Rifle Caliber	5.56 NATO
Manufacturer	Pro2A Tactical

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PRO2A LEFT HAND 14.5" 5.56 NATO 1/7 Mid Length Melonite M-LOK AR-15 Upper with Flash Can - Pinned & Welded