Pro2A Left Hand 20" 6mm ARC Rifle Length Melonite M-LOK AR-15 Upper Receiver

PRO2A LEFT HAND 20" 6mm ARC 1/7.5 Rifle Length Melonite M-LOK AR-15 Upper

Description

The Pro2A Tactical Left-Handed 20-inch 6mm ARC Complete Upper Receiver assembly delivers optimized velocity and long-range structural precision to southpaw shooters on the AR-15 platform. Built with a heavy-duty, field-verified design in Georgia, this upper pairs a velocity-maximizing 20-inch barrel with a smooth-cycling rifle-length gas system and a true left-hand ejection receiver. It is engineered explicitly for left-handed hunters, PRS competitors, and target shooters looking to stretch the effective range of their standard AR-15 lower receiver setup without dealing with blowback in their face.

Key Features

True Left-Handed Design: Engineered with a left-side ejection port to keep gas, debris, and spent casings clear of southpaw shooters' line of sight.
6mm ARC Performance: Harnesses the advanced ballistics of the 6mm Advanced Rifle Cartridge, providing flat trajectories and low wind drift that rivals larger short-action cartridges.
Fast 1/7.5 Twist Rate: Optimized to stabilize heavier, high-ballistic coefficient (BC) match and hunting projectiles perfectly for tight downrange groups.
Rifle-Length Gas Tuning: Minimizes felt recoil and cycling wear by introducing a smooth, extended pressure curve ideal for long-range strings of fire.

Technical Specifications

Upper Receiver	Milspec Billet Aluminum M4 Flat Top Receiver, Left Hand Ejection, M4 Feed Ramps (Type III Hardcoat Anodized)
Barrel Length & Profile	20-Inch Medium Profile
Caliber	6mm ARC (Advanced Rifle Cartridge)
Twist Rate	1:7.5 Twist
Barrel Material	4150 Chrome Moly Vanadium Steel with Premium Corrosion-Resistant Melonite Finish
Gas System Length	Rifle Length Direct Impingement with 0.750 Low-Profile Gas Block
Handguard	15 Inch Free Float Slim Profile M-LOK Rail System with Integrated Top Picatinny Rail
Muzzle Thread & Device	5/8x24 Thread Pitch with Standard A2 Flash Hider

Why Choose This Product?

Bridging the gap between the portable AR-15 layout and true long-range capabilities requires proper mechanical tolerance matching, especially for left-handed operators. The Pro2A Left Hand 20" 6mm ARC Upper Receiver takes the guesswork out of headspacing and cyclic reliability by using perfectly paired barrel and left-hand bolt components built under strict quality controls. The rugged Melonite barrel treatment ensures exceptional bore life, easy cleaning, and extreme environmental resistance. If you need maximum downrange performance without upgrading to a heavy AR-10 platform or compromising on left-handed ergonomics, this complete factory-assembled upper is the ultimate drop-in solution.