PRO2A 12.5" 350 Legend Pistol Length NR Side Charging M-LOK Upper

PRO2A 12.5" 350 Legend 1/16 Pistol Length NR Side Charging Melonite M-LOK AR-15 Upper

Product Overview

The PRO2A 12.5" 350 Legend 1/16 Pistol Length NR Side Charging Melonite M-LOK AR-15 Upper strikes the ultimate balance between hard-hitting straight-walled velocity and quick handling maneuverability. Designed for optimized e-commerce deployment, this upper receiver swaps out standard rear charging layouts for a fluid, Non-Reciprocating (NR) side-charging handle configuration. The 12.5-inch barrel length hits a ballistic sweet spot for the 350 Legend cartridge, burning propellant completely while maintaining a compact, agile footprint that is ideal for thick brush hunting, home defense builds, or space-saving transport configurations.

Key Features

Non-Reciprocating Side Charging: Fluid manual control handle remains completely stationary while the action cycles, giving you absolute structural clearance for optics without moving parts near your support hand.
Balanced 12.5-Inch Profile: Yields optimal velocity retention and downrange energy transfer over short pistol platforms while preserving outstanding handling speeds in tight configurations.
Optimized 1/16 Twist Rate: Precision-rifled land profile engineered explicitly to rotationally stabilize common heavy hunting and defensive grain variations of .357 straight-wall projectiles.
Salt Bath Melonite Treatment: High-performance QPQ Melonite finish internally case-hardens the bore and protects external steel against high-volume friction, heat scoring, and wet weather elements.
Reliable Pistol Gas Calibration: Tuned pistol-length gas port paired with a low-profile gas block provides consistent pressure cycling with dependable straight-wall case extraction.
Free-Float Slim M-LOK Handguard: Enhances intrinsic accuracy by completely isolating barrel harmonics, providing an expansive top Picatinny rail and clear side M-LOK slots for accessories.

Technical Specifications

Charging System:	Non-Reciprocating (NR) Side-Charging System
Caliber / Chamber:	350 Legend (Straight-Wall Regulation Compliant)
Barrel Length & Contour:	12.5 Inches Medium Profile
Barrel Material:	4150 Chrome Moly Vanadium Steel
Twist Rate:	1:16 Twist
Barrel Finish:	QPQ Melonite / Black Nitride Corrosion-Resistant Exterior and Interior Lining
Gas System Profile:	Pistol-Length Gas System with 0.750" Low Profile Gas Block Set
Muzzle Device:	Standard 5/8-24, Enlarged to 35 Cal, A2 Flash Hider
Upper Receiver Type:	Gibbz Arms G4 Billet Aluminum Side-Charging Receiver Architecture, Gen 2 Handle (Type III Hardcoat Anodized)
Handguard Profile:	10 Inch Slim Free-Float Modular M-LOK Handguard Layout with Full Top Picatinny Rail Layout
Manufacturing Origin:	100% Proudly Made in the USA

Why Choose This Product?

For marksmen operating under straight-wall legislative limits or looking for reliable close-quarters energy, the 350 Legend cartridge provides an exceptional balance of low recoil and massive kinetic transfer. Traditional rear charging handles force you to break your cheek weld and drop out of your optical plane just to manipulate the bolt. The PRO2A 12.5" Side Charging Upper eliminates this roadblock entirely, providing a fluid side-charging configuration that lets you cycle the action comfortably while staying completely locked onto your downrange target.

While ultra-short barrels restrict full propellant combustion, this 12.5-inch configuration retains optimal muzzle velocity and expansion profiles while keeping the platform light and fast-handling inside tight hunting blinds or vehicles. Enveloped in an ultra-durable QPQ Melonite anti-corrosion barrier, matched with a rigid billet receiver, and finished with a lightweight free-float M-LOK rail system, this drop-in platform strips away configuration headaches to give you a clean-cycling precision powerhouse built for severe service straight out of the box.

More Information

More Information
SKU	P2ANR350LBW10PIS125-TK
Rifle Caliber	350 Legend
Manufacturer	Pro2A Tactical

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PRO2A 12.5" 350 Legend 1/16 Pistol Length Melonite M-LOK AR-15 Upper with Flash Can