Product Description

Maximize the full ballistic performance, maximum muzzle velocity, and long-range accuracy of the 350 Legend straight-walled cartridge with the complete PRO2A 20" 350 Legend Carbine-Length Non-Reciprocating (NR) Side Charging AR-15 Upper Kit. This master build package provides a meticulously headspaced 20-inch barrel assembly paired with a reliable carbine gas track system and a Gibbz Arms G4 billet side-charging receiver. Engineered as an all-in-one building solution, this kit comes fully populated with a premium side-charging M16 profile bolt carrier group, an integrated non-reciprocating charging handle assembly, a complete mil-spec lower parts kit, and a full carbine stock assembly—supplying every essential internal component required to finish your stripped lower receiver.

Key Features

• All-Inclusive Master Build Kit: Bundles the complete barreled upper receiver with a premium side-charging bolt carrier group, non-reciprocating charging mechanics, full lower parts kit, and rear receiver stock assembly.
• Non-Reciprocating Left-Side Charger: The patent-pending Gibbz Arms G4 side-charging handle remains stationary during cycling, preventing standard rear charging handle interference under large long-range optics or high-profile hunting scopes.
• Optimized Velocity Profile: 20-inch heavy-duty barrel profile ensures full powder burn to capture maximum velocity, flat trajectories, and true match-grade terminal performance for hunting environments.
• Straight-Wall Hunt Compliance: Specifically optimized for the 350 Legend cartridge, granting maximum lawful efficacy in states with restrictive straight-wall public land harvesting mandates.
• 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 15-inch free-floating M-LOK handguard for rigid mounting stability.

Technical Specifications

Why Choose This Product?

The PRO2A 20" 350 Legend Carbine Length Non-Reciprocating Side Charging Kit removes the complexity of sourcing structural precision components across separate vendors by providing a perfectly headspaced and balanced ecosystem out of the box. Sourcing standalone components often creates headspacing risk or feeding failure with straight-walled cases. This system resolves that constraint out of the box, utilizing a single large M4 feed ramp configuration built explicitly to chamber straight-wall ammunition smoothly. Standard rear charging systems force shooters to compromise on optical eye-relief or wrestle with low-clearance mounts. By employing the specialized Gibbz Arms G4 system, this platform allows fast, unhindered charging mechanics while utilizing an extended 20-inch precision barrel to maximize downrange kinetic energy. Completely paired with an advanced M16 Nitride side-charging bolt group, lower frame parts, and stock hardware, this system ensures total hardware harmony under the protection of a full Structural Lifetime Warranty.