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Engineered from the ground up for southpaw operators, this premium true left-handed AR-15 upper assembly pairs a 12.5-inch 4150 CMV Melonite-treated barrel with a mirrored forged 7075-T6 aluminum receiver. Designed to clear your visual workspace by ejecting spent casings to the left, this compact upper delivers high-velocity ballistics, aggressive 1:7 stabilization, and an ultra-slim free-float M-LOK handguard for an uncompromising left-handed tactical advantage.
| Upper Receiver | True Left-Hand Mil-Spec Upper, Billet Aluminum, Left-Facing Ejection Port &, Type III Hardcoat Anodized Black |
|---|---|
| Barrel Length & Steel | 12.5 Inch Medium Contour Profile, 4150 Chrome Moly Vanadium (CMV) Steel, Melonite Treated |
| Caliber Chamber | 5.56 NATO (Fully backward compatible with .223 Remington) |
| Twist Rate | 1:7 Twist (Optimized for stabilizing heavy duty 62gr, 69gr, and 77gr defense bullets) |
| Gas Operating Block | Carbine-Length Direct Impingement, Low-Profile 0.750" Gas Block Machined from 4140 Steel, Stainless Steel Gas Tube |
| Muzzle Device | Standard 1/2x28 Thread Pitch, A2 Birdcage Flash Hider with Crush Washer Pre-Installed |
| Handguard | 10 Inch Slim Profile Free-Float M-LOK Rail, Full-Length 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 12.5" 5.56 NATO Upper Receiver solves the primary performance hurdle facing southpaw shooters: the uncomfortable compromises of running standard right-handed firearms. Left-handed operators running standard right-handed receivers must tolerate gas vents drifting directly toward their eyes and hot brass arcing across their visual workspace. By establishing a true left-eject mechanism, this upper assembly creates an unobstructed field of view and clean, distraction-free weapon manipulations.
Opting for a 12.5-inch barrel delivers a distinct mechanical advantage over traditional 10.5-inch close-quarters builds. The extra two inches of bore significantly expand powder combustion times, rewarding you with higher muzzle velocities, reduced muzzle blast signature, and softer internal component wear. Completed with an aggressive 1:7 twist Melonite barrel and a slim free-float M-LOK handguard, this upper provides left-handed shooters with a durable, accurate, and ergonomic upgrade that is 100% American-made and backed by a structural Lifetime Factory Warranty.
| SKU | P2AL556BW10CAR125-TK |
|---|---|
| Barrel Length | 12.5 inch |
| Rifle Caliber | 5.56 NATO |
| Manufacturer | Pro2A Tactical |