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Unlock optimized close-quarters performance and heavy-grain ballistic efficiency out of your left-handed AR-15 platform with this premium 100% American-made upper receiver assembly. The PRO2A LEFT HAND 7.5" 300 Blackout Upper anchors a compact, premium Melonite-treated 4150 CMV barrel to a true left-handed, left-ejecting mil-spec forged 7075-T6 aluminum receiver. Complete with a reliable pistol-length gas block system, a slim free-float M-LOK handguard, a pre-headspaced left-handed precision bolt carrier assembly, and a standard muzzle device, this assembly delivers everything required to seamlessly transform your lower receiver into a hard-hitting tactical or suppressed asset.
| Upper Receiver | True Dedicated Left-Hand Upper Receiver, Billet Aluminum, M4 Feed Ramps, Type III Hardcoat Anodized Black Finish |
|---|---|
| Barrel Length & Steel | 7.5 Inch Profile, 4150 Chrome Moly Vanadium Steel, Medium Contour, Melonite Treated |
| Caliber | 300 AAC Blackout (300 BLK) |
| Twist Rate Options | 1:7 Twist or 1:5 Twist |
| Gas Operating Block | Pistol-Length System, Low-Profile Gas Block Machined from 4140 Steel, Stainless Steel Gas Tube |
| Muzzle Device | Standard 5/8x24 Thread Pitch, A2 Birdcage Flash Hider with Crush Washer Pre-Installed |
| Handguard | 6.5 Inch Slim Profile Free-Float M-LOK Rail, Semi 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 7.5" 300 Blackout Melonite Upper directly solves the three biggest hurdles facing close-quarters southpaw builders: managing uncomfortable right-handed debris exhaust, stabilizing heavy subsonic ammunition in a short barrel, and maintaining cycling reliability across mixed load profiles. Traditional setups force left-handed shooters to tolerate gas vents drifting directly toward their eyes and hot brass arcing across their visual workspace. Our true mirrored left-eject mechanism preserves an unobstructed field of view. While standard right-handed short builds dump gas into your face, this configuration keeps the platform clean and functional.
Furthermore, having the option to choose a specialized 1:5 fast twist rate allows heavy, slow-moving sub-sonic bullets to stabilize immediately upon leaving a short 7.5-inch bore. This fast-spin architecture eliminates the projectile yawing or keyholing often experienced with standard twist rates, ensuring absolute downrange accuracy and preventing destructive baffle strikes when running a suppressor. Backed completely by Pro2A Tactical's signature Lifetime Factory Warranty and engineered with 100% American-made materials, this upper receiver delivers premium reliability custom-built for your natural shooting posture.
| SKU | P2AL300BLKAXC65PIS75-TK |
|---|---|
| Barrel Length | 7.5 inch |
| Rifle Caliber | 300 Blackout |
| Manufacturer | Pro2A Tactical |
