Product Overview

The PRO2A LEFT HAND 16" 6mm ARC 1/7.5 Mid Length NR Side Charging Melonite M-LOK AR-15 Upper Kit is an all-inclusive, masterfully engineered southpaw build system optimized for long-range precision and tactical adaptability. Centered around a **Left-Eject Non-Reciprocating (NR) side-charging billet receiver**, this kit moves your manual manipulation controls to a fixed left-side handle, allowing left-dominant operators to cycle the system or clear faults without taking their eye off the optic or disrupting their cheek weld. The 16-inch barrel length fully unleashes the flat-shooting, high-coefficient ballistics of the innovative 6mm ARC cartridge while maintaining an agile rifle-length configuration. Packed with a dedicated left-handed Type II full-auto profile bolt carrier group, side-charging handle mechanics, a complete lower parts package, and a robust polymer blade assembly, this kit delivers a seamless, turnkey customization pipeline with zero component matching guesswork.

Key Features

• All-In-One Complete Kit Pipeline: Consolidates your entire construction project by seamlessly bundling internal left-handed cycling mechanics, fire control linkages, small lower parts, and stabilizing furniture inside one premium assembly order.
• True Left-Hand Architecture: Features a dedicated left-side ejection port to prevent facial gas blowback and hot spent brass exposure for southpaw shooters.
• Non-Reciprocating Mechanical Leverage: The billet left-side charging lever remains completely static when firing, mitigating traditional optics footprint obstructions and maximizing operation speed.
• High-Coefficient 1:7.5 Twist Stabilization: Explicitly bored to flawlessly stabilize dynamic low-drag, heavy-grain 6mm ARC projectiles over extreme distance brackets.
• Smooth Mid-Length Gas Subsystem: Moderates internal pressure velocity spikes to yield a softened recoil pulse, flat tracking re-acquisition, and minimal component wear compared to over-gassed short configurations.
• Liquid QPQ Melonite Barrel Preservation: Full-immersion nitriding hardens the 4150 CMV steel barrel structure inside and out to prevent aggressive gas throat attrition and resist environmental humidity.
• Free-Floating Modular Handguard: Lean M-LOK rail profile matches perfectly with the upper top deck, maintaining absolute accessory placement stability without stressing barrel harmonics.

Technical Specifications

Why Choose This Product

Choosing this complete 16-inch 6mm ARC left-handed kit modernizes long-range shooting workflows for southpaws who refuse to compromise with standard right-hand controls. Combining a dedicated left-eject receiver pathway with a stationary left-side charging lever entirely eradicates facial gas exposure and unnatural workspace manipulation. Furthermore, because headspacing and bolt depth variations (.136 face depth Type II vs Type I alternatives) can cause catastrophic cycling failures in the 6mm ARC platform, utilizing this factory-matched package ensures maximum tracking reliability out of the box. Packed with premium treated components from the full-auto profile tracking group down to the polished lower linkages, this kit represents the peak of custom tactical value. Proudly manufactured 100% in the USA from heavy-duty raw metals.