PRO2A LEFT HAND 10.5" 350 Legend 1/16 Pistol Length NR Side Charging Melonite M-LOK AR-15 Upper Kit
Product Overview
The PRO2A Left Hand 10.5" 350 Legend Master Upper Kit delivers a high-performance, dedicated southpaw building option for the popular straight-walled cartridge. Engineered around a premium Gibbz Arms G4 Left-Handed Non-Reciprocating (NR) side-charging billet receiver, this system throws gas and spent casings safely to the left while keeping the cycle path completely independent of optics. This master build package comes completely populated with an optimized premium left-handed Bolt Carrier Group (BCG), a full Mil-Spec lower parts kit (LPK), and an adjustable rear receiver pistol brace assembly to remove all guesswork from your next custom hunting build.
Key Features
- All-Inclusive Master Build Kit: Bundles the complete barreled upper receiver with a premium bolt carrier group, charging handle, full lower parts kit, and rear receiver pistol brace assembly.
- Ultra-Compact Profile: 10.5-inch heavy target barrel configuration delivers massive close-range kinetic energy transfer from a highly maneuverable, lightweight footprint.
- Non-Reciprocating Side Charging Mechanics: Advanced side-charging handle design remains completely stationary during cyclic firing, eliminating moving external interferences and optimizing clearance for low-mounted optics and thermal scopes.
- QPQ Melonite Extreme Armor: Barrel bore, chamber, and exterior are fully liquid nitrocarburized to exceed mil-spec chrome lining in surface hardness, heat dissipation, and corrosion resistance.
- Slim Profile M-LOK Workspace: Features a continuous top Picatinny rail interface seamlessly blended into a 9-inch free-floating M-LOK handguard for rigid optics and accessory mounting stability.
Technical Specifications
| Caliber / Chambering | 350 Legend (Straight-Walled Cartridge) |
|---|---|
| Barrel Length / Steel | 10.5 Inches / 4150 Chrome Moly Vanadium (CMV) Steel |
| Barrel Finish & Profile | QPQ Melonite / Black Nitride (Internal & External) — Medium Profile |
| Twist Rate / Feed Ramps | 1:16 Twist / Engineered Single-Large M4 Feed Ramp Profile for Reliable Straight-Wall Case Feeding |
| Gas System Mechanics | Pistol Length Direct Impingement with a 0.750" Low-Profile Steel Gas Block |
| Charging System | Right-Side Non-Reciprocating Handle Assembly (Gen 2 Handle Components Included) |
| Upper Receiver Housing | Gibbz Arms G4 Left-Hand Non-Reciprocating (NR) Side Charging Billet Aluminum, Type III Hardcoat Anodized |
| Handguard System | 9-Inch Ultra-Lightweight Free-Float Aluminum M-LOK Rail System |
| Muzzle Configuration | Standard A2 Flash Hider / 5/8x24 TPI Thread Pitch |
| Bolt Carrier Group (BCG) | True Left-Hand Ejection M16 Profile, Case Hardened 8620 Steel Carrier, 9310 Steel Bolt (MPI Tested), Advanced Nitride Finish |
| Charging Handle | Integrated Left-Hand Non-Reciprocating (NR) Side Charging Handle Assembly (Remains Stationary During Firing) |
| Lower Parts Kit (LPK) | Complete AR-15 Lower Parts Kit (Standard Milspec ELG Trigger / Fire Control Group, Pistol Grip, Detents, Springs, Pins, and Safety Selector) |
| Brace & Buffer Assembly | Premium Adjustable Pistol Stabilizing Brace, Pistol Receiver Extension Tube, Carbine Recoil 3oz Buffer, and High-Tensile Buffer Spring |
| Manufacturing Origin | 100% Designed, Machined, and Assembled in the United States |
| Warranty Protection | Backed by Pro2A Tactical's Structural Lifetime Warranty |
Why Choose This Product?
Left-handed operators building straight-wall firearms frequently struggle with standard right-side ejection obstacles, face gas blowback, and face severe blast from compact configurations. Pro2A Tactical solves this comprehensively by combining an authentic left-eject billet side charger with an optimized 350 Legend single-ramp chamber. Complete with every sub-component matching this specialized layout, it stands as the ultimate, uncompromised master kit for southpaw marksmen looking to assemble a premium, legal-compliant hunting pistol layout.
