PRO2A 5" 9mm 1/10 Pistol Caliber NR Side Charging Melonite M-LOK Upper with Flash Can

The Ultimate Sub-Compact AR-9 Host with Stationary Side Cocking and Forward Blast Direction

Construct the ultimate personal defense weapon (PDW) with lightning-fast handling, an intuitive manual configuration, and focused linear muzzle mechanics. The PRO2A 5" 9mm Pistol Caliber Non-Reciprocating (NR) Side Charging Upper Assembly with Flash Can delivers elite modern ergonomics by ditching the traditional rear dual-latch pull tab for a left-side charging lever. The handle stays fully stationary while firing, providing a seamless operating zone free from moving external components near your optics. Pre-equipped with a slimline tactical flash can, it forces intense short-barrel gas concussion and muzzle noise straight forward downrange away from the operator. Built around a micro 5-inch 4150 CMV steel barrel and optimized for robust blowback cycling, this premium upper drops natively onto dedicated 9mm lowers or standard AR-15 lowers using 9mm magazine conversion blocks. Proudly 100% designed, machined, and precision-assembled in the USA.

Key Features

Stationary Side-Charging Interface: The premium non-reciprocating left-side manual handle operates completely independently from the bolt carrier cycle. This allows for fluid charging from a prone or benched position and seals off the rear opening to block high-pressure gases and carbon debris from venting backward into your face.
Integrated Slimline Flash Can: Pre-installed on the muzzle to tame the sharp acoustic blast typical of micro-barrel configurations. It acts as a linear director, projecting noise, gas, and flash away from the shooter to maximize training lane and tight-quarters comfort.
Ultra-Compact 5-Inch Barrel Profile: Yields the ultimate footprint optimization for quick targets transitions, weapon packing, and vehicle deployment while extracting full defensive powder efficiency out of the standard 9mm Luger cartridge.
Melonite/Nitride Barrel Protection: The heavy-duty 4150 CMV steel barrel is fully Nitride/Melonite treated inside and out. This premium chemical hardening vastly extends barrel life, aids in uniform thermal dissipation, and counters harsh weather corrosion.
Slim Profile Free-Float M-LOK Rail: Built from durable 6061-T6 aluminum, the free-float handguard completely isolates barrel vibrations to preserve uniform mechanical accuracy while offering extensive M-LOK accessory attachment space and a continuous top Picatinny rail.

Technical Specifications

Upper Receiver Style	Gibbz Arms G9 Non Reciprocating Side Charging Billet Aluminum with Gen 2 Handle, Type III Hardcoat Anodized Black
Barrel Length & Steel	5 Inch Profile, 4150 Chrome Moly Vanadium Steel
Caliber	9mm Luger / 9x19mm Parabellum
Twist Rate	1:10 Twist (Optimized to stabilize common 115gr, 124gr, and heavy 147gr sub-sonic bullets)
Gas / Operating Block	Solid Direct Blowback Operating System (No Gas Tube or Gas Block Needed)
Muzzle Device Config	9mm Thread Pitch 1/2-28, Pre-Installed Slimline Linear Flash Can
Handguard	7 inch Slim Profile Competition Top Free-Float M-LOK Handguard, Extended Profile Partially Tucking the Muzzle Device, Machined from 6061-T6 Aluminum
Manufacturing	100% Made in the USA with Pro2A Tactical Lifetime Factory Warranty

Who Chooses This Upper Receiver?

Southpaw Ultra-Compact Truck & Backpack Builders

Enthusiasts building an agile, highly concealable personal defense weapon choose this 5-inch setup. The side-charging billet design seals the traditional rear handle opening, completely blocking blowback gas and powder flecks from leaking into your eyes.

Tactical Indoor & Close-Quarters Shooters

Operators training inside confined environments or indoor lanes select this flash-can-equipped upper. It channels the sharp muzzle concussion of the short 5" barrel completely forward and away from the shooter and adjacent lane partners, minimizing uncomfortably loud side-blast feedback.

Oversized Optics & Red Dot Operators

Marksmen running larger reflex sights, low-power variable optics (LPVOs), or thermal frames prefer side-charging platforms. The left-side handle clears the wide undersides of scope mounts, protecting hands from scrape damage during rapid charging manipulation.