PRO2A 7.5" 7.62x39 1/10 Pistol Length Melonite M-LOK AR-15 Upper Receiver

Bring hard-hitting, intermediate-power performance to an ultra-compact footprint with this premium 100% American-made upper receiver assembly. The PRO2A 7.5" 7.62x39 Pistol Length Upper 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 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 standard 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

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 7.5-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 Pistol-Length Gas Dwell: Configured precisely around the specialized dwell times and pressure curves of a 7.5-inch barrel firing 7.62x39. The low-profile gas block delivers smooth carrier tracking and reliable extraction cycles.
Ultra-Compact Tactical Maneuverability: Strikes the ultimate balance between close-quarters vehicle operations and hard-hitting intermediate ballistics, giving operators a nimble personal defense weapon profile that retains decisive terminal energy.
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, Type III Hardcoat Anodized Black Finish, Forward Assist & Port Cover
Barrel Length & Steel	7.5 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	Pistol-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, A2 Birdcage Flash Hider with Crush Washer
Handguard	7 Inch Slim Profile Free-Float M-LOK Rail, Competition 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 7.5" 7.62x39 Pistol Length Melonite M-LOK Upper directly solves the three biggest hurdles facing intermediate sub-compact builders: light primer strikes on surplus ammunition, harsh structural gas dwell times, and part-by-part home building variations. 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.

Opting for a 7.5-inch medium contour barrel path offers a massive physical advantage for operators who prioritize high-energy tactical defense within tight confines. It provides an exceptionally light, nimble muzzle profile that navigates around home defense barriers or vehicle interiors effortlessly, while still ensuring the heavy 7.62x39 cartridge delivers devastating energy downrange compared to standard 5.56 variants of a similar length. 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.

More Information