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Pack immense straight-wall knockdown power into a maneuverable, compact package designed with mirror-image ergonomics. The PRO2A LEFT HAND 10.5" 400 Legend Pistol Length Melonite M-LOK Upper Assembly strikes the perfect balance between ballistic velocity retention and tight-quarters portability—optimized explicitly for left-handed operators. Built around a premium left-hand ejecting forged 7075-T6 aluminum receiver with feed geometry optimized for thick straight-wall ammunition body cycling, this setup keeps escaping gases and spent brass completely away from your face. It houses a 10.5-inch 4150 CMV medium profile barrel with a stable 1:16 twist rate that keeps heavy hunting projectiles perfectly stabilized. Operating on a tuned pistol-length direct impingement gas cycle, this turn-key platform arrives paired with a dedicated left-handed cartridge-matched bolt carrier group. Drop this upper (with your or our BCG) directly onto your standard AR-15 lower receiver setup to build the ultimate left-handed brush hunting firearm, close-range hog tracking gun, or compact defense build.
| Upper Receiver Type | Left-Hand Eject Mil-Spec Billet Aluminum, Optimized Straight-Wall Profile, Single Large Feed Ramp, Type III Hardcoat Anodized Black |
|---|---|
| Barrel Length & Profile | 10.5-Inch Medium Profile Barrel |
| Caliber | 400 Legend (Winchester Straight-Wall) |
| Twist Rate | 1:16 Twist Rate (Optimized for standard weight straight-wall hunting loads) |
| Barrel Material & Finish | 4150 Chrome Moly Vanadium (CMV) Steel with QPQ Melonite Nitride Finish |
| Gas System Topology | Pistol Length Direct Impingement System with Low-Profile Gas Block |
| Handguard Matrix | 9 Inch Slim Free Float Aluminum M-LOK Handguard Rail System |
| Muzzle Device | Standard A2 Big Bore Flash Hider, 5/8x24 Thread Pitch Configuration |
Shorter barrels introduce unique pressure variables when adapting straight-wall platforms to compact frames—an issue amplified for left-handed marksmen forced to use standard right-handed setups. Pro2A Tactical resolves this directly. By matching a dedicated left-hand single feed ramp receiver with a precision 10.5-inch Melonite barrel, this upper drops right onto your lower receiver to supply heavy energy impact, space-saving maneuverability, and field safety proudly built in the USA.
| SKU | P2AL400AX9PIS105-HT |
|---|---|
| Barrel Length | 10.5 inch |
| Rifle Caliber | 400 Legend |
| Manufacturer | Pro2A Tactical |