PRO2A 5" 7.62x39 1/10 Micro Length Melonite M-LOK AR-15 Upper with Flash Can

Bring hard-hitting, intermediate-power performance to an ultra-compact footprint with this premium 100% American-made upper receiver assembly. The PRO2A 5" 7.62x39 Micro Length Upper with Flash Can anchors a match-ready, premium Melonite-treated 4150 CMV barrel to a mil-spec forged upper receiver optimized for maximum maneuverability. Complete with an optimized micro/pistol-length gas operating block, a slim free-float M-LOK handguard, a pre-headspaced premium bolt carrier assembly with an enhanced firing pin, and a blast-forwarding flash can muzzle device, this assembly delivers everything required to seamlessly convert any standard stripped lower receiver into a responsive personal defense weapon or hard-hitting sub-compact asset.

Key Features

Linear Blast-Directing Flash Can: Outfitted with a premium flash can muzzle device that pushes concussive muzzle blast, high-pressure gases, and flash strictly forward away from the operator. This design significantly reduces felt side-concussion, making it ideal for compact short-barrel configurations and group shooting environments.
Reliable Steel-Case Ignition System: Built precisely to handle the hard military primers standard in affordable steel-cased 7.62x39mm surplus and training ammunition. The pre-headspaced bolt carrier group features an enhanced firing pin with specialized geometry to guarantee reliable, crisp primer strikes on every shot.
Heavy-Duty Melonite Barrel Protection: The 5-inch 4150 CMV steel barrel is fully treated with an advanced Salt Bath Melonite finish inside and out. This premium chemical hardening vastly extends bore life against rapid gas throat erosion at the port and shields components against moisture in the field.
Precision 1:10 Right-Hand Twist: Precision button-rifled with a versatile 1:10 twist configuration engineered specifically to maximize rotational velocity and instantaneous projectile stabilization out of the micro-chamber, ensuring uniform downrange groupings.
Optimized Micro-Length Gas Dwell: Configured precisely around the specialized dwell times and pressure curves of an ultra-short 5-inch barrel firing 7.62x39. The low-profile gas block delivers smooth carrier tracking and reliable extraction cycles.
Slim Profile Free-Float M-LOK Rail: Crafted from premium 6061-T6 aluminum, the free-float rail isolates barrel vibrations to preserve uniform mechanical accuracy while providing massive M-LOK modular real estate.

Technical Specifications

Upper Receiver	Mil-Spec Upper Receiver, Forged 7075-T6 Aluminum, M4 Feed Ramps, Forward Assist & Port Cover, Type III Hardcoat Anodized Black Finish
Barrel Length & Steel	5 Inch Profile, 4150 Chrome Moly Vanadium (CMV) Steel, Medium Contour, Melonite Treated
Caliber	7.62x39mm
Twist Rate	1:10 Twist (Optimized for standard 122gr to 124gr projectiles and heavy intermediate loads)
Gas Operating Block	Micro Length Direct Impingement System, Low-Profile 0.750" Gas Block Machined from 4140 Steel, Stainless Steel Gas Tube
Muzzle Device	Standard 5/8x24 Thread Pitch, Slimline Multi-Slot Linear Flash Can Hardcoat Anodized Pre-Installed
Handguard	6.5 Inch Slim Profile Free-Float M-LOK Rail, Competition Top Picatinny Rail, Machined from 6061-T6 Aluminum (Tuck Design Over Flash Can)
Manufacturing Origin	100% Made in the USA with Pro2A Tactical Lifetime Factory Warranty

Why Choose This Product?

The PRO2A 5" 7.62x39 Micro Length Melonite M-LOK Upper with Flash Can directly solves the three biggest hurdles facing intermediate sub-compact builders: harsh short-range muzzle concussion, light primer strikes on surplus ammunition, and part-by-part home building variations. While generic ultra-short barreled assemblies generate a violent side blast that can disrupt your firing stance or nearby shooters, our integrated linear flash can channels all sound and pressure directly downrange. This guarantees a significantly tamed operation profile, allowing you to maximize the high-energy, hard-hitting performance of the 7.62x39 cartridge comfortably within a micro build.

While generic 7.62x39 AR builds frequently experience feeding failures and weak primer ignition due to out-of-spec components, Pro2A Tactical builds this system around an enhanced firing pin and a tailored direct impingement gas block. This setup ensures relentless extraction cycles out of the box while keeping your training and range costs incredibly low by smoothly devouring steel-cased ammo. Backed completely by Pro2A Tactical's signature Lifetime Factory Warranty and engineered with 100% American craftsmanship, this complete upper receiver assembly converts your platform into a high-performance, duty-ready asset with absolute confidence.

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