PRO2A LEFT HAND 20" 5.56 NATO 1/7 Rifle Length Melonite M-LOK AR-15 Upper Kit

Product Description

The PRO2A Left Hand 20" 5.56 NATO Rifle Length Melonite M-LOK AR-15 Upper Kit is an all-inclusive conversion package precision-engineered for left-handed shooters seeking peak ballistic performance and downrange accuracy. Featuring a full 20-inch barrel to extract maximum muzzle velocity from the 5.56 NATO cartridge, this comprehensive completion bundle eliminates all parts-matching guesswork. It pairs a true left-ejecting forged upper receiver and specialized left-handed bolt carrier group with a complete lower completion hardware pack and adjustable stock system, transforming any standard stripped lower receiver into a highly ergonomic southpaw marksman rifle.

Key Features

True Left-Hand Configuration: Mirrored left-side ejection port orientation safely directs scorching expansion gases and empty shell casings completely clear of a southpaw shooter's face and eyes.
Velocity-Maximizing 20" Barrel: Extended 20-inch footprint provides an optimal internal powder burn layout, squeezing peak velocities and flatter trajectories out of heavy-duty 5.56 NATO loads.
Smooth Rifle-Length Gas System: Incorporates a full rifle-length gas profile to optimize system dwell time, lowering bolt carrier slide speeds and dramatically softening mechanical recoil impulses.
All-In-One Rifle Completion: Bundles your high-accuracy 20-inch upper assembly with a dedicated left-hand BCG, standard top-charging handle, complete lower parts kit, and an adjustable stock completion package.
Premium Melonite Structural Treatment: Heavy-duty 4150 CMV steel is thoroughly liquid nitrided to secure supreme environmental corrosion resistance, uniform heat displacement, and an extended bore throat life.

Technical Specifications

Upper Receiver	Billet Aluminum, M4 Feed Ramps (Dedicated Left-Hand Ejection Port Setup)
Charging Handle	Standard Mil-Spec Charging Handle
Bolt Carrier Group	Milspec Left-Hand M16 Full Auto Profile, QPQ Nitride/Melonite Treated, MPI Tested
Barrel Length & Profile	20-Inch Medium Profile
Caliber	5.56 NATO (Safely accepts .223 Remington)
Twist Rate	1:7 Twist Rate (Highly optimized for standard 62gr to heavy 77gr match ammunition)
Barrel Material	4150 Chrome Moly Vanadium Steel with QPQ Melonite Nitride Finish
Gas System	Rifle Length Direct Impingement with Low-Profile Gas Block
Handguard	15-Inch Free Float Slim Profile M-LOK Handguard Rail System
Muzzle Device	A2 Flash Hider (1/2x28 Thread Pitch)
Lower Parts Kit	Complete AR-15 Lower Parts Kit (LPK) including Pivot/Takedown Pins, Bolt Catch, Magazine Catch, Springs, Detents, Standard Pistol Grip, and Mil-Spec Fire Control Group (Trigger & Hammer Assembly)
Stock Assembly	M4 Carbine Adjustable Buttstock, 6-Position Mil-Spec Buffer Tube (Receiver Extension), Carbine Recoil Buffer, and Spring

Why Choose This Product?

This premium 20-inch left-handed build bundle provides a seamless pathway to full ballistic efficiency and traditional long-range marksman utility without compromising on user ergonomics. By integrating a dedicated left-handed bolt carrier group with full lower receiver completion small parts and a soft-shooting rifle-length gas profile, it completely cuts out the harsh unburned powder blowback and facial debris common when shooting standard right-handed uppers left-handed. Built for maximum velocity stability and matched field longevity, it delivers home builders a streamlined, rugged solution optimized for continuous service operations.