PRO2A 10.5" 300 Blackout 1/7 or 1/5 Pistol Length Melonite AR-15 Upper Kit

Product Overview

The PRO2A 10.5" 300 Blackout 1/7 or 1/5 Pistol Length Melonite AR-15 Upper Kit delivers a robust, highly versatile platform specifically engineered to exploit the terminal ballistics of the .300 AAC Blackout cartridge. This comprehensive, premium kit combines an ultra-reliable pistol-length gas system with elite barrel options, removing the component guesswork and giving you everything needed to build a hard-use personal defense weapon or range-ready tactical build.

Key Features

Optimized Twist Rate Choices: Choose between a versatile 1:7 twist for standard supersonic options or a lightning-fast 1:5 twist rate highly optimized for stabilizing heavy subsonic projectiles in shorter barrels.
Premium QPQ Melonite Barrel: Sub-surface liquid nitriding gives the 4150 CMV barrel exceptional hardness, extreme corrosion protection, and long-lasting rifling integrity under sustained strings of fire.
All-In-One Assembly Package: Includes a complete Mil-Spec lower parts kit and high-density polymer adjustable blade assembly alongside the upper components to streamline your entire project build.
Slim Profile M-LOK Handguard: A free-floating modular rail lines up cleanly with the receiver, giving you abundant room for weapon lights, laser systems, and ergonomic hand stops without bulk.

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	10.5-Inch Medium Profile
Caliber	300 AAC Blackout (300 BLK)
Twist Rate	1:7 Twist or 1:5 Fast Twist Available (Select variant for optimized subsonic/supersonic stabilization)
Barrel Material	4150 Chrome Moly Vanadium Steel with Premium Melonite/QPQ Treatment
Gas System	Pistol Length Direct Impingement with Low-Profile Gas Block
Handguard	10-Inch Free Float Slim Profile M-LOK Rail System
Muzzle Device	Standard A2 Flash Hider (5/8x24 Thread Pitch)
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

This premium Pro2A Tactical configuration bridges the gap between reliable cycling mechanics and high-yield operational performance. By tailoring the gas subsystem specifically to a pistol length gas loop and providing a dedicated choice for an ultra-fast 1:5 barrel configuration, this upper package minimizes typical short-barrel dwelling issues when handling subsonics. 100% proudly manufactured in the USA from heavy-duty raw metals, it provides unmatched value and out-of-the-box system compatibility.