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Ditch the typical right-hand configuration setbacks and stop breathing in blowing gas or blinking at hot flying brass. The PRO2A Left Hand 12.5" 5.56 NATO Mid-Length Melonite M-LOK Upper Receiver Assembly is engineered from the ground up to cater specifically to southpaw marksmen. By integrating a dedicated, mirrored left-ejection receiver port layout with an elite mid-length gas system—an exceptionally rare configuration on a short 12.5-inch barrel setup—this upper provides a soft recoil pulse and cleaner manual operation. It drops natively onto any standard left-handed or ambidextrous Mil-Spec lower receiver to create a highly mobile pistol or registered Short Barreled Rifle (SBR). Proudly 100% designed, machined, and precision-assembled in the USA.
| Receiver | Dedicated Left Hand (Left Eject), Forged 7075-T6 Aluminum, M4 Feed Ramps, Type III Hardcoat Anodized Black |
|---|---|
| Barrel Length & Steel | 12.5 Inch Profile, 4150 Chrome Moly Vanadium Steel, Medium Weight Contour |
| Caliber | 5.56 NATO (Compatible with .223 Remington ammunition) |
| Twist Rate | 1:7 Twist (Optimized to stabilize heavy duty 62gr and heavy 77gr duty ammo) |
| 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 Flash Hider with Crush Washer |
| Handguard | 12 Inch Slim Profile Competition Top Free-Float M-LOK Handguard, Machined from 6061-T6 Aluminum |
| Manufacturing Origin | 100% Made in the USA with Pro2A Tactical Lifetime Factory Warranty |
Southpaw marksmen tired of compromising on standard right-handed rifles choose this dedicated left-eject setup to keep escaping gas, burning powder residue, and hot brass completely out of their peripheral line of sight.
Shooters who run frequent carbine courses or dynamic drills value the rare integration of a mid-length gas system on a 12.5-inch barrel. It accelerates transition tracking speeds while minimizing wrist fatigue by softening muzzle snap and bolt cycling velocities.
Left-hand shooters planning to host a suppressor benefit heavily from a left-hand port layout. Suppressors drastically increase backpressure, and a left-ejecting receiver combined with a smoother mid-length path prevents that concentrated gas from venting directly back into the shooter's face.
| SKU | P2AL556ACT12MID125-KAK |
|---|---|
| Barrel Length | 12.5 inch |
| Rifle Caliber | 5.56 NATO |
| Manufacturer | Pro2A Tactical |
