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11.5 inch LEFT HAND 5.56 NATO Nitride Upper | Pro2A Tactical

PRO2A LEFT HAND 11.5" 5.56 NATO 1/7 Carbine Length Melonite M-LOK AR-15 Upper with Flash Can

PRO2A LEFT HAND 12.5" 5.56 NATO 1/7 Carbine Length Melonite M-LOK AR-15 Upper with Flash Can

PRO2A LEFT HAND 12.5" 5.56 NATO 1/7 Carbine Length Melonite M-LOK AR-15 Upper with Flash Can

PRO2A LEFT HAND 12.5" 5.56 NATO 1/7 Carbine Length Melonite M-LOK AR-15 Upper

Rating:
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Special Price $279.99 $459.99
Availability:
In stock
SKU
P2AL556BW10CAR125-TK
PRO2A Left Hand 12.5" 5.56 NATO Carbine Length Melonite M-LOK AR-15 Upper Receiver

PRO2A Left Hand 12.5" 5.56 NATO 1/7 Carbine Length Melonite M-LOK AR-15 Upper Receiver

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.

Key Features

  • True Left-Handed Ejection Profile: Engineered with a mirrored receiver geometry and a dedicated left-hand ejection port. It deflects spent brass out to the left, away from a left-handed shooter's face and vision, eliminating gas blowback and hot casing distraction.
  • Versatile 12.5-Inch Barrel Profile: Strikes the ultimate balance between compact maneuverability and reliable ballistics. The 12.5" configuration maintains a high velocity footprint compared to shorter variants while keeping the weapon highly nimble in confined environments.
  • Fast 1:7 Right-Hand Twist Rate: Precision button-rifled to handle heavy duty ammunition profiles. This aggressive 1:7 twist configuration instantly stabilizes standard 55gr training rounds up to heavy 69gr and 77gr low-drag precision match projectiles.
  • Salt Bath Melonite Case Hardening: The heavy-duty 4150 CMV steel barrel features a premium Melonite (QPQ Nitride) liquid treatment inside the bore and out. This structural shell resists intense gas port erosion and harsh outdoor humidity better than traditional chrome linings.
  • Tuned Carbine-Length Gas System: Configured precisely for the gas dwell times of a 12.5-inch barrel layout. This direct impingement system works seamlessly with standard carbine buffers to deliver soft, dependable extraction cycles.
  • Modular Slim Free-Float M-LOK Rail: Built from rigid 6061-T6 aluminum, the 10-inch free-floating handguard isolates physical hand pressure from the barrel to protect structural groupings while providing clean mounting slots for tactical accessories.

Technical Specifications

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

Why Choose This Product?

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.

More Information
SKU P2AL556BW10CAR125-TK
Barrel Length 12.5 inch
Rifle Caliber 5.56 NATO
Manufacturer Pro2A Tactical
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