Radical Firearms Complete Upper Assembly - .223 Remington, 16" Barrel, M-LOK Handguard

A Radical Firearms complete upper assembly in .223 Remington with a 16" barrel and M-LOK handguard is a plug-and-play upper receiver built to drop straight onto any mil-spec lower receiver—exactly what you need to finish an AR build without the guesswork. Whether you're assembling your first rifle or adding a fresh upper to your inventory, this is the kind of no-nonsense component that lets you spend your time at the range instead of chasing compatibility issues.

The upper starts with a forged 7075 T6 aluminum receiver finished in Type III hard anodizing, the same durability standard you'll find on top-tier rifles. The free-float rail system decouples the handguard from the barrel, which means better accuracy and consistency—especially valuable if you're running precision loads or dialing in a new optic. The M-LOK slots give you straightforward mounting for lights, grips, bipods, and other tactical gear without rail clutter.

Under the hood, you're getting a nitride-finished bolt carrier group paired with a mil-spec charging handle. Nitride coating adds corrosion resistance and extends the life of the bolt, a small detail that pays off over hundreds of rounds. This is practical engineering: nothing exotic, nothing overly complicated, just solid AR fundamentals that work.

The 16" barrel length puts you in the sweet spot for general-purpose shooting—short enough to handle in tight spaces, long enough for reasonable velocity and sight radius. Assembly-wise, you'll need to mate it to a compatible mil-spec lower receiver and you're ready to configure it to your role, whether that's home defense, range work, or hunting medium game.

Key Features

• Free-float rail system for improved accuracy and consistency
• Forged 7075 T6 aluminum upper receiver with Type III hard anodizing
• M-LOK handguard for modular accessory mounting
• Nitride bolt carrier group for enhanced corrosion resistance
• Mil-spec charging handle
• Complete assembly drops onto any mil-spec lower receiver

Specifications

Frequently Asked Questions

Will this upper fit my lower receiver?

Yes, as long as your lower receiver is mil-spec standard. This upper is designed to drop onto any mil-spec lower—the most common AR configuration. If you're unsure about your lower, verify it uses standard mil-spec dimensions before ordering.

What does a free-float handguard do?

A free-float rail doesn't make contact with the barrel, which means the barrel isn't pulled or twisted by the mounting system. This improves accuracy and consistency, especially noticeable when you're running optics or testing different loads. It's a genuine precision upgrade in a practical AR package.

Is this upper ready to shoot out of the box?

This is a complete upper receiver assembly, so it has all the internal parts and external furniture. You'll need to attach it to a mil-spec lower receiver, and then add a stock, grip, safety, and trigger—or use a lower you already own. The upper itself is complete.

What kind of shooting is this upper good for?

The 16" barrel and free-float rail make this upper versatile for range shooting, general-purpose hunting, and home defense applications. The M-LOK handguard gives you flexibility to configure it toward your specific needs with tactical or precision accessories.