Pro2A Left Hand 12.5" 5.56 NATO Mid Length Melonite M-LOK Upper Kit

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

Description

The Pro2A Tactical Left-Handed 12.5-inch 5.56 NATO Complete Upper Kit packages optimized tactical handling, soft recoil dynamics, and true southpaw ergonomics into a comprehensive rifle transformation layout. Hand-assembled and quality checked in Georgia, this kit marries a dedicated left-hand ejection upper receiver to a highly desired mid-length gas setup. Outfitted with a matching left-hand bolt carrier group, full lower parts kit, and a complete stock assembly hardware package, it provides southpaw operators with an all-in-one drop-in solution engineered to simplify their build while keeping hot brass and exhaust out of their face.

Key Features

True Left-Handed Architecture: Features a dedicated left-side ejection port design that protects southpaw shooters from flying gas blowback, hot brass, and concussive muzzle debris.
Soft-Shooting Mid-Length System: Highly coveted mid-length gas design on a 12.5" platform significantly reduces port pressure spikes, minimizing felt recoil, slowing cyclic bolt carrier rates, and extending internal component life.
All-In-One Transformation Package: Streamlines your assembly by providing a fully populated left-hand upper receiver group, standard charging handle, matching left-hand nitride BCG, complete lower parts kit (LPK), and a full blade/buffer tube system.
Premium Melonite Integrity: Treated inside and out with an ultra-hard Melonite finish, maximizing barrel bore life and defending against corrosive elements while offering effortless cleanings.

Technical Specifications

Upper Receiver	Milspec Forged 7075-T6 Aluminum M4 Flat Top Receiver, Left Hand Ejection, M4 Feed Ramps (Type III Hardcoat Anodized)
Barrel Length & Profile	12.5-Inch Medium Profile
Caliber	5.56 NATO (Safely processes both 5.56x45mm and .223 Remington)
Twist Rate	1:7 Twist
Barrel Material	4150 Chrome Moly Vanadium Steel with Premium Corrosion-Resistant Melonite Finish
Gas System Length	Mid Length Direct Impingement with 0.750 Low-Profile Gas Block
Handguard	12 Inch Free Float Slim Profile M-LOK Rail System with Integrated Top Picatinny Rail
Muzzle Thread & Device	1/2x28 TPI Standard A2 Flash Hider
Bolt Carrier Group & Handle	Left Hand Full Auto M16 Profile, 9310 Bolt, 8620 Carrier, Nitride Finish, MPI Tested. Standard Charging Handle
Lower Parts Kit	Complete AR-15 LPK with Pins, Springs, Detents, Grip, and Polished Mil-Spec Fire Control Group
Stock Assembly	Pistol Buffer Tube Assembly, Carbine Buffer, Spring, Castle Nut, Endplate, and Adjustable High Density Polymer Blade

Why Choose This Product?

Stepping away from traditional over-gassed carbine setups on short barrels is crucial for structural cycling performance, especially when handling a dedicated left-handed weapon configuration. The Pro2A Left Hand 12.5" 5.56 NATO Upper Kit addresses these constraints entirely by pairing factory-headspaced southpaw components with an extended mid-length gas system and a perfectly headspaced left-hand bolt configuration. By combining all build elements into a cohesive factory package, it erases configuration troubleshooting and third-party part variations. For southpaw operators demanding premium structural rigidity, maximized tactical maneuverability, and smooth operational consistency, this complete package is the ultimate drop-in transition solution.