PRO2A 16" 350 Legend Side Charging AR-15 Upper Kit | M-LOK

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

Product Description

Engineered for unparalleled reliability and precision, the PRO2A 16" 350 Legend Complete Upper Assembly Kit delivers straight-walled cartridge performance perfect for strict hunting regulations and heavy-impact target shooting. This modular configuration centers around the world-renowned Gibbz Arms G4 patent-pending non-reciprocating side-charging platform, eliminating typical charging handle interference under large optics. Matched with a premium, wear-resistant Melonite-treated barrel, this complete kit includes all matching internal elements and dynamic modular mechanics to completely update or build your AR-15 platform with match-grade quality.

Key Features

Non-Reciprocating Design (NR): Left-side charging handle stays stationary during cycling to optimize operator safety and charging leverage under minimal clearance.
Melonite Barrel Protection: Nitrocarburized surface treatment significantly enhances barrel life, improves heat dissipation, and prevents environmental corrosion over traditional chrome-lining.
Gibbz Arms G4 Billet Architecture: Machined from solid block 7075-T6 structural aluminum with an integrated detent block preventing blowback gas migration to the shooter’s face.
Free-Float Slim Handguard: Engineered with a continuous top Picatinny rail and fully distributed M-LOK layout to support heavy optics and custom mission configurations without shifting barrel zero.

Technical Specifications

Caliber / Chambering	350 Legend (Straight-Walled Cartridge)
Barrel Length	16 Inches
Barrel Material	4150 Chrome Moly Vanadium (CMV) Steel
Barrel Finish	QPQ Melonite / Black Nitride (Interior and Exterior)
Barrel Contour	Medium Profile
Twist Rate	1:16 Twist
Gas System Length	Carbine Length
Gas Block Journal	0.750 Inch Low-Profile Steel Gas Block
Upper Receiver	Gibbz Arms G4 Billet Aluminum Non-Reciprocating Side Charging Receiver, Gen 2 Handle
Bolt Carrier Group (BCG)	M16 Profile, Case Hardened 8620 Carrier, 9310 Steel Bolt, Nitride Coated
Handguard Design	12-Inch Free-Float M-LOK Rail with Continuous Top Picatinny Rail
Muzzle Device	Standard 5/8-24 (Enlarged to 35 Cal) A2 Flash Hider with Crush Washer
Feed Ramps	Enlarged M4 Single Feed Ramp Configuration for 350 Legend Case Reliability
Lower Parts	Milspec Polished Trigger Group, Standard Lower Parts, A2 Grip
Stock Assembly	Milspec M4 Stock, 6 position Buffer Tube, 3oz Carbine buffer, Spring, Castle Nut, Latch Plate
Manufacturing Origin	100% Designed and Made in the United States

Why Choose This Product?

The PRO2A 16" 350 Legend Non-Reciprocating Side Charging Upper Kit solves the historical challenges of hunting with modern sporting platforms. 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 managing the precise 1:16 twist rate needed to accurately stabilize commercial heavy hunting grains. Complete with precision tolerances and backed by Pro2A’s strict Lifetime Structural Warranty, it stands out as a highly reliable, high-tier configuration choice for modern shooters demanding elite performance.

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