PRO2A Left Hand 10.5" 300 Blackout 1/7 Pistol Length Melonite M-LOK AR-15 Upper

PRO2A LEFT HAND 10.5" 300 Blackout 1/7 Pistol Length Melonite M-LOK AR-15 Upper

Product Overview

The PRO2A LEFT HAND 10.5" 300 Blackout 1/8 Pistol Length Melonite M-LOK AR-15 Upper delivers uncompromised tactical ergonomics and versatile ballistics to left-handed shooters looking for the ultimate short-barreled platform. Chambered in the powerful .300 AAC Blackout cartridge, this complete upper receiver assembly features true left-hand ejection geometry to keep high-pressure gas blowback and hot spent casings entirely away from your sightlines. Built with a highly desirable 10.5-inch barrel length, this setup optimizes velocity retention for supersonic rounds while maintaining a maneuverable profile for subsonic configurations, making it perfect for home defense, close-quarter training, or compact hunting applications.

Key Features

True Left-Handed Ejection: Built around a mirrored billet receiver architecture that safely throws spent brass and expanding carbon residue away from left-dominant eyes.
Versatile 1/7 Twist Rate: Precision-rifled profile engineered to provide excellent stability across a wide variety of bullet weights, comfortably cycling light supersonic and heavy subsonic ammunition.
Premium Melonite Barrel Protection: Highly durable Salt Bath Nitride (QPQ Melonite) finish hardens internal bore surfaces for superior wear resilience and maximum corrosion protection.
Tuned Pistol-Length Gas System: Rigorously calibrated to deliver optimal dwell time, softening felt recoil and ensuring smooth cycling even under heavy service use.
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.

Technical Specifications

Receiver Orientation:	True Left-Handed / Left Ejection Port
Caliber / Chamber:	.300 AAC Blackout (300 BLK)
Barrel Length:	10.5 Inches Medium Profile
Barrel Material:	4150 Chrome Moly Vanadium Steel
Twist Rate:	1:7 Twist or 1:5 Twist Profile
Barrel Finish:	QPQ Melonite / Black Nitride Finish
Gas System Length:	Pistol-Length System with 0.750" Low Profile Gas Block
Muzzle Device:	5/8x24 TPI A2 Flash Hider and Crush Washer
Upper Receiver:	Left-Hand Billet Aluminum (Type III Hardcoat Anodized)
Handguard:	9 Inch Ergonomic Slim Free-Float M-LOK Handguard Layout with Continuous Top Rail
Manufacturing Origin:	100% Made in the USA

Why Choose This Product?

For left-handed shooters, deploying a standard right-handed short-barrel rifle often means enduring face-level gas spray and erratic brass pathways—particularly when utilizing high-pressure cartridges like the 300 Blackout. This PRO2A upper eliminates those drawbacks by implementing premium, mirrored mechanical geometry right out of the box. By balancing an ideal 10.5" barrel dwell time with premium Melonite armor treatment, it provides southpaw marksmen a durable, highly dependable close-quarters configuration that requires zero awkward adaptation.

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