PRO2A 14.5" 5.56 NATO 1/7 Mid Length Melonite AR-15 Upper Kit

Product Overview

The PRO2A 14.5" 5.56 NATO 1/7 Mid Length Melonite AR-15 Upper Kit provides an all-inclusive, high-performance workspace solution tailored to deliver an optimal balance of velocity, reduced recoil, and maneuverability. Featuring a highly versatile 14.5-inch profile, this configuration maximizes muzzle velocity metrics out of the 5.56x45mm NATO cartridge while maintaining superior close-quarters agility. Outfitted with a smooth-cycling mid-length gas loop, a dedicated full-auto profile M16 bolt carrier group, a standard charging handle, a complete lower parts matrix, and a polymer adjustable blade package, it simplifies custom construction by handling all critical tracking and cycling calculations right out of the box.

Key Features

All-In-One Complete Kit Pipeline: Consolidates your entire shopping list by providing the internal cycling mechanics, fire control group, lower frame small parts, and stabilizing furniture inside one premium assembly order.
Maneuverable 14.5-Inch Profile: Yields optimal tactical mobility and rapid handling while maintaining excellent fragmentation velocity out of the 5.56 NATO cartridge.
Smooth Mid-Length Gas Subsystem: Delivers a softer recoil pulse, lowered pressure peaks, and reduced internal component wear compared to harsh, over-gassed carbine setups.
Military-Grade 1:7 Twist Profile: Highly optimized to reliably stabilize heavier tactical and defense projectiles (such as 62gr, 69gr, and 77gr match loads) over extended operational envelopes.
Liquid QPQ Melonite Preservation: Full-immersion liquid nitriding creates an incredibly slick, hard-wearing surface inside the 4150 CMV steel barrel core to handle sustained friction, gas wear, and humidity.
Free-Floating M-LOK Handguard: Features a slim-profile modular rail system aligned flat with the upper receiver top rail, optimizing accessory placement without shifting your barrel's point of impact.

Technical Specifications

Upper Receiver	Milspec 7075-T6 Forged Aluminum, M4 Feed Ramps, Forward Assist & Dust Cover, Type III Hardcoat Anodized Black
Charging Handle	Standard Mil-Spec Charging Handle
Bolt Carrier Group	Milspec Full-Auto Profile, Nitride Treated, 8620 Steel Carrier, 9310 Steel Bolt, MPI Tested
Barrel Length & Profile	14.5-Inch Medium Profile
Caliber	5.56 NATO (Accepts .223 Remington)
Twist Rate	1:7 Twist Rate (Optimized for heavy grain tracking and duty round stabilization)
Barrel Material	4150 Chrome Moly Vanadium Steel with Premium Melonite/QPQ Treatment
Gas System	Mid Length Direct Impingement with Low-Profile Gas Block
Handguard	12-Inch Free Float Slim Profile M-LOK Rail System (Ensures clean accessory clearance)
Muzzle Device	Standard A2 Flash Hider with Crush Washer (1/2x28 Thread Pitch - Non-Pinned)
Lower Parts Kit	Complete AR-15 Lower Parts Kit (LPK) including Pivot/Takedown Pins, Bolt Catch, Magazine Catch, Springs, Detents, Standard Pistol Grip, and Polished Mil-Spec Fire Control Group (Trigger & Hammer)
Blade Assembly	High Density Polymer Adjustable Blade, Pistol Buffer Tube (Receiver Extension), Carbine Recoil 3oz Buffer, and Spring

Why Choose This Product

Choosing this complete 14.5-inch mid-length upper kit eliminates component guesswork, delivering a factory-matched package optimized specifically for smooth cycling and absolute field reliability. Because shorter barrel weapon variants depend heavily on proper gas pressure curves and cycling timing, using a factory-matched kit prevents typical parsing extraction errors. Moving to a mid-length gas system decreases the internal system stress compared to a standard carbine setup, ensuring softer target tracking and flat follow-up tracking. Packed with premium treated components from the full-auto profile bolt carrier down to the polished fire control linkages, it delivers absolute mechanical reliability. Proudly manufactured in the USA from heavy-duty raw metals, this setup ensures an uncompromising tactical response straight out of the box.

More Information