PRO2A LEFT HAND 8.5" 300 Blackout 1/7 Pistol Length Melonite M-LOK AR-15 Upper

Product Overview

The PRO2A LEFT HAND 8.5" 300 Blackout 1/7 Pistol Length Melonite M-LOK AR-15 Upper delivers uncompromised tactical ergonomics and versatile ballistics in an ultra-compact footprint designed explicitly for southpaw operators. Chambered in the powerful .300 AAC Blackout cartridge, this upper receiver assembly features a true left-side ejection architecture that eliminates safety hazards and visual distractions by throwing spent brass and harsh carbon gas blowback away from your eyes. Built for speed, reliability, and extreme maneuverability, it serves as the ultimate foundation for a hard-hitting personal defense weapon (PDW), compact pistol, or suppressed SBR build.

Key Features

True Left-Hand Ejection: Built around a mirrored receiver layout and a dedicated left-hand bolt carrier group to route spent brass and escaping gases safely clear of left-dominant eyes.
Optimized 8.5-Inch Barrel: Specifically cut to the industry-preferred sweet spot for the 300 Blackout cartridge, securing full powder burn and maximum ballistic performance in a highly compact envelope.
Fast 1/7 Twist Rifling: Precision-rifled land pitch engineered to provide exceptional rotational stabilization for a versatile array of bullet weights, effortlessly cycling light supersonic ammo and heavy subsonic loads alike.
QPQ Melonite Case Hardening: High-end Salt Bath Nitride finish hardens the internal bore and outer barrel surfaces against aggressive surface wear, deep outdoor moisture, and rapid thermal gas scoring.
Free-Float Slim M-LOK Handguard: Enhances intrinsic accuracy by isolating barrel harmonics, providing an expansive top Picatinny rail and clear M-LOK attachment slots for tactical gear.

Technical Specifications

Receiver Orientation:	True Left-Handed / Left Ejection Port Architecture
Caliber / Chamber:	300 AAC Blackout (300 BLK)
Barrel Length & Contour:	8.5 Inches Medium Taper Contour
Barrel Material:	4150 Chrome Moly Vanadium Steel - Made for us by Tactical Kinetics
Twist Rate:	1:7 Twist
Barrel Coating Finish:	QPQ Melonite / Black Nitride Corrosion-Resistant Coating
Gas System Length:	Pistol-Length Gas System with 0.750" Low Profile Gas Block
Muzzle Device:	Standard 5/8-24 A2 Flash Hider
Upper Receiver Type:	Milspec Billet Left-Hand Aluminum Receiver (Type III Hardcoat Anodized)
Handguard Profile:	7 Inch Slim Free-Float Modular M-LOK Rail System with Continuous Top Picatinny Rail System
Manufacturing Origin:	100% Proudly Made in the USA

Why Choose This Product?

Traditional right-handed firearms compromise a southpaw operator's comfort by spraying hot gas, debris, and abrasive carbon blast right across their line of sight—an issue that is heavily amplified when shooting short-barreled setups or running a suppressor. The PRO2A Left Hand 8.5" 300 Blackout Upper removes these limitations entirely. By integrating a dedicated left-ejecting chassis, you can cycle the weapon naturally from the shoulder without breaking your optical alignment or risking facial debris strikes.Choosing an 8.5-inch barrel ensures you hit the ultimate ballistic sweet spot for the 300 BLK cartridge, giving you full burn efficiency and maximum kinetic energy from an ultra-compact platform. Backed by heavy-duty 4150 steel construction, a high-durability Melonite finish, and a fast 1/7 twist rate built to stabilize everything from lightweight range loads to heavy subsonic defensive ammunition, this upper receiver assembly delivers a clean, reliable, and entirely uncompromised tactical upgrade straight out of the box.