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The Pro2A Left Hand 13.7" 5.56 NATO Mid Length Non-Reciprocating (NR) Side Charging Upper Receiver offers the perfect solution for southpaw shooters searching for the absolute shortest rifle-length footprint without stepping into NFA short-barreled rifle regulations. Chambered in the universally trusted 5.56 NATO (fully backward-compatible with .223 Remington), this premium left-ejecting upper features a muzzle device that is permanently pinned and welded to the barrel threads to legally satisfy the 16-inch federal requirement. Shifting traditional rear charging motions over to an ergonomic side handle design, this setup delivers significantly reduced felt recoil, minimized component wear, and clears gas blowback away from left-handed operators.
| Upper Receiver | Patented Gibbz Arms G4 Billet Aluminum Non-Reciprocating Side Charging Upper Receiver, Left Hand Ejection, Enlarged Ejection Port, M4 Feed Ramps, Anodized Finish |
|---|---|
| Charging System | Right-Side Non-Reciprocating Charging System (Static Handle Design) for Left-Eject Configuration |
| Barrel Length & Profile | 13.7-Inch Government Profile (Brings overall barrel length to a legal 16-inches via pinned and welded muzzle device) |
| Caliber | 5.56 NATO (.223 Remington Compatible) |
| Twist Rate | 1:7 Twist |
| Barrel Material & Treatment | 4150 Chrome Moly Vanadium Steel, Premium Corrosion-Resistant Melonite Finish |
| Gas Operating Block | Mid-Length Direct Impingement, 0.750" Low-Profile Steel Gas Block, Stainless Steel Gas Tube |
| Muzzle Thread & Device | 1/2x28 Thread Pitch, "Pro2A Flash Guardian 3 Prong Flash Hider" Permanently Pinned & Welded to ATF Compliance Standards |
| Handguard Rail | 12" Slim Free-Float M-LOK Handguard, Machined from 6061-T6 Aluminum with Top Picatinny Rail Layout |
| Manufacturing Origin | 100% Made in the USA with Pro2A Tactical Lifetime Factory Warranty |
Southpaw shooters wanting the maximum handling advantages of a short-barreled carbine without legal restrictions pick this 13.7-inch build. The permanently attached muzzle assembly preserves a true rifle classification while keeping spent casings and facial gases away from their eyes.
Operators looking for a reliable, soft-shooting platform choose the mid-length gas system configuration. It extends the longevity of standard cycling components, lowers mechanical strain, and provides highly ergonomic right-side non-reciprocating manipulation handle actuation.
Custom gunsmiths aiming to update a standard small-frame lower into a mirrored, robust side-charging configuration choose this complete upper. It snaps easily onto standard mil-spec lower assemblies using a left-handed side-charging BCG design, bypassing layout risks.
| SKU | P2ALNR556GFS12MID137-BA-PW |
|---|---|
| Barrel Length | 13.7 inch |
| Rifle Caliber | 5.56 NATO |
| Manufacturer | Pro2A Tactical |
