Radical Firearms 16" 300 Blackout Upper Assembly, 1:8 Twist, 15" RPR MLOK HandGuard, A2 Flash Hider

The Radical Firearms 16" 300 Blackout upper assembly is a plug-and-play solution for builders who want a complete, functional upper without the guesswork. Built around the compact and subsonic-friendly 300 Blackout cartridge, this upper pairs a 16-inch barrel with a 1:8 twist rate and an A2 flash hider—a straightforward setup that works for everything from suppressed range days to hunting medium game. Drop it on any mil-spec lower receiver and you're ready to go.

The 15-inch RPR MLOK handguard gives you modern modularity for mounting lights, grips, or other accessories without the weight penalty of older designs. The free-float rail system decouples the barrel from the handguard, supporting consistent accuracy shot to shot—a real advantage whether you're dialing in loads or running drills. Built from forged 7075 T6 aluminum and finished with Type III hard anodizing, this upper is engineered to handle hard use and long-term reliability.

Whether you're assembling your first 300 Blackout or adding another upper to your arsenal, this assembly cuts through the confusion and gets you a complete, battle-tested platform. No hunting for individual components, no compatibility headaches—just solid engineering from a maker that understands what shooters actually need.

Key Features

• Complete mil-spec upper assembly—ready to attach to any standard mil-spec lower receiver
• 16-inch barrel in 300 Blackout with 1:8 twist rate
• Free-float rail system for improved shot-to-shot consistency
• 15-inch RPR MLOK handguard with modern accessory mounting
• A2 flash hider included
• Forged 7075 T6 aluminum construction
• Type III hard anodized finish for durability

Specifications

Frequently Asked Questions

Will this upper work with my existing lower receiver?

Yes, this is a complete mil-spec upper assembly that drops onto any standard MIL-STD lower receiver. As long as your lower is mil-spec, you're good to go.

Is this upper assembled and ready to shoot?

This is a complete upper assembly, so it comes fully assembled. You'll only need to attach it to your lower receiver—no additional upper assembly work required.

What is the 1:8 twist rate good for?

The 1:8 twist rate is the standard for 300 Blackout and will stabilize the full range of factory and hand-loaded ammunition in that caliber, from lighter supersonic rounds to heavier subsonic loads.

Can I mount a suppressor to the A2 flash hider?

The upper ships with an A2 flash hider. Suppressor compatibility depends on your specific suppressor's mounting system—check your suppressor's documentation for compatibility with A2-style muzzle devices.