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Engineered to change the game for Southpaw shooters looking for an ideal tactical length with unmatched manipulation controls. The PRO2A Left Hand 13.7" 5.56 NATO Non-Reciprocating (NR) Side Charging AR-15 Upper introduces structural equity to left-dominant operators. By flipping the ejection geometry to the left side and moving the traditional charging configuration to a non-reciprocating side-charging setup, this receiver redirects stinging facial gases and brass safely away from your path of vision. Built around a 13.7-inch 4150 CMV steel barrel, this upper is highly sought after for pin-and-weld projects to achieve a compact rifle layout. It includes Pro2A Tactical's matching, left-hand side-charging bolt carrier group (BCG) right out of the box and seamlessly fits standard Mil-Spec AR-15 lower receivers. Proudly 100% designed, machined, and precision-tested in the USA.
| Upper Receiver Style | Gibbz Arms LEFT HANDED G4 Non Reciprocating Side Charging Billet Aluminum Receiver with Gen 2 Handle, M4 Feed Ramps, Type III Hardcoat Anodized Black |
|---|---|
| Charging Handle Style | Right-Side Non-Reciprocating Manual Cocking Assembly (Stays Stationary While Firing) |
| Barrel Length & Steel | 13.7 Inch Profile, 4150 Chrome Moly Vanadium Steel, Medium Contour, Melonite Treated |
| Caliber | 5.56 NATO (Fully compatible with .223 Remington ammunition) |
| Twist Rate | 1:7 Twist (Optimized to stabilize heavy duty 62gr, 69gr, and 77gr match loads) |
| Gas Operating Block | Mid-Length System, Low-Profile Gas Block Machined from 4140 Steel, Stainless Steel Gas Tube |
| Muzzle Device | Standard 1/2-28 Thread Pitch, A2 Birdcage Flash Hider with Crush Washer |
| Handguard | 12 Inch Slim Profile Free-Float M-LOK Rail, Top Picatinny Rail, Machined from 6061-T6 Aluminum |
| Manufacturing Origin | 100% Made in the USA with Pro2A Tactical Lifetime Factory Warranty |
The PRO2A Left Hand 13.7" 5.56 NATO NR Side Charging Upper Assembly bridges the gap between left-handed utility, modern side-charging speed, and compact rifle compliance. Traditional right-handed builds force Southpaw operators to inhale unburnt powder residue and hot gas blowback, an issue that multiplies dramatically when shooting fast strings or using suppressors. Moving the ejection path to the left side permanently rectifies this issue, offering optimal eye and lung safety.
Furthermore, selecting a 13.7-inch barrel with a mid-length gas system establishes an extremely pleasant shooting dynamic. It avoids the harsh cycling velocity of carbine gas ports while trimming valuable inches off the front of your rifle compared to standard 16-inch options. Combined with a robust, stationary side-charging system, you can charge your weapon or manipulate the bolt seamlessly from a natural shooting position without losing your target view. Backed completely by Pro2A Tactical's signature Lifetime Factory Warranty and machined with 100% American craftsmanship, this upper delivers a custom, high-speed solution right out of the box.
| SKU | P2ALNR556GFS12MID137-BA |
|---|---|
| Barrel Length | 13.7 inch |
| Rifle Caliber | 5.56 NATO |
| Manufacturer | Pro2A Tactical |
