PRO2A 16" 5.56 NATO 1/7 NR Side Charging Melonite M-LOK AR-15 Upper

Upgrade your rifle dynamics with the PRO2A 16" 5.56 NATO Non-Reciprocating (NR) Side Charging AR-15 Upper Receiver Assembly. Engineered from the ground up for superior ergonomics and smooth operation, this premium complete upper drops directly onto any standard Mil-Spec AR-15 lower receiver. Shifting the charging system to a stationary, left-side location clears room over traditional rear handles and provides uninterrupted clearance for large rifle scopes and optics. Built around an ultra-durable 1/7 twist Melonite barrel and a specialized side-charging carrier, it delivers reliable, flat-shooting accuracy with defensive or target ammunition.

Key Features

Non-Reciprocating Left-Side Handle: The side charging handle remains completely stationary while firing to protect the shooter's hands and clear mounted optics or cheek risers.
Advanced Melonite Barrel Protection: The premium 4150 CMV steel barrel is fully treated with an advanced Salt Bath Melonite finish inside the bore and across the exterior to extend service life and maximize corrosion resistance.
Optimal 1:7 Twist Rate: Precision button-rifled with an optimized 1:7 twist configuration engineered specifically to stabilize standard 55gr up to heavy match-grade 62gr and 77gr 5.56 NATO / .223 Rem projectiles.
Smooth Mid-Length Gas Dynamics: Configured with a mid-length gas system to provide soft, reliable cycling pressures that reduce internal wear and tame felt muzzle recoil.
Slim Profile Free-Float M-LOK Handguard: Machined from high-strength aluminum, the lightweight handguard isolates barrel vibrations to preserve uniform accuracy while providing a continuous top rail and modular M-LOK spacing.

Technical Specifications

Upper Receiver Assembly	Gibbz Arms G4 Premium Non-Reciprocating Side Charging Upper Receiver, M4 Feed Ramps, Left-Side Handle Slot, Type III Hardcoat Anodized Black Finish
Charging Handle	Left-Side Non-Reciprocating Charging Handle Assembly (Stationary During Firing Cycle)
Barrel Component	Choice of Barrel: Carbine Length M4 Profile, Mid Length Govt Profile or Carbine Length CHF (Cold Hammer Forged) M4 Profile - all of them are 16 inch, 5.56 NATO Caliber, 4150 Chrome Moly Vanadium Steel, 1:7 Twist, Nitride/Melonite Treated
Caliber	5.56 NATO (Accepts .223 Remington)
Twist Rate	1:7 Twist
Gas Operating Block & System	Carbine or Mid-Length Gas System, Low-Profile Gas Block Machined from 4140 Steel, Stainless Steel Gas Tube
Muzzle Device Component	Standard 1/2x28 Thread Pitch, A2 Birdcage Flash Hider with Crush Washer Pre-Installed
Handguard Rail	12 Inch Slim Profile Free-Float Aluminum Handguard, Continuous Top Picatinny Alignment, Modular M-LOK Attachment Points
Manufacturing Origin	100% Assembled and Quality Checked in the USA with Pro2A Tactical Lifetime Factory Warranty

Why Buy This Product?

Traditional rear-charging AR uppers create ergonomic bottlenecks when running large tactical scopes, making manipulations clumsy or awkward. The PRO2A 16" 5.56 NATO Non-Reciprocating Side Charging Upper directly resolves this friction by integrating a smooth, left-side manual cocking mechanism. Combined with a soft-shooting mid-length gas system and a premium 1:7 twist Melonite barrel, this upper offers an incredibly flat-shooting platform that ensures precise shot placement. Hand-assembled, headspaced, and quality-tested in the USA, it provides a seamless blend of duty-grade reliability and modernized AR ergonomics.