My Cart: 0 item(s)
Rosco 300 Blackout Barrel | Duty-Grade 300BLK Barrels
Rosco 300 Blackout Barrels — Duty-Grade Precision for Suppressed & Unsuppressed Builds
Mission Built. Suppressor Ready. 100% USA Made.
At Mounts Plus, we proudly offer the full range of Rosco 300 Blackout Barrels, designed to deliver elite performance for tactical and defense AR builds.
From compact PDWs to full-size rifles, Rosco 300 Blackout Barrels provide the accuracy, durability, and reliability demanded by professionals and serious shooters.
✅ 4150 CMV Steel Construction
✅ QPQ Nitride Finish for Extreme Durability
✅ Tuned for Subsonic and Supersonic 300BLK Loads
✅ Fast Shipping | Trusted Dealer
🛡️ Why Choose a Rosco 300 Blackout Barrel?
Built to dominate in suppressed and unsuppressed applications, the Rosco 300 Blackout Barrel is the ideal foundation for any AR-15 chambered in 300BLK.
Key Advantages:
- Suppressor-Ready Gas Port Tuning
- Superior Wear and Corrosion Resistance
- Sub-MOA Accuracy Potential
- Lightweight, Compact, and Duty-Proven Profiles
- Optimized for Heavy Subsonic & Lighter Supersonic Loads
🔥 Rosco 300 Blackout Barrel Features
- 4150 CMV (Chrome Moly Vanadium) Steel Barrel
- QPQ Nitride Surface Hardening
- 1:7 Twist Rate for Stabilizing Subsonic and Supersonic Ammo
- Pistol-Length Gas Systems for Suppressed Performance
- MPI and Air Gauged for Consistent Quality
- Standard 0.750" Gas Block Journal
- Pre-dimpled Gas Block Location (varies by model)
✅ Designed for performance in every shot — quiet or loud.
📚 Rosco 300 Blackout Barrel Buyer's Guide
📌 Bloodline Series — Made for the Fight
Every Rosco 300 Blackout Barrel in the Bloodline series is tuned for suppressed performance without sacrificing durability or reliability.
| Feature | Benefit |
|---|---|
| Material | 4150 CMV Steel for Extreme Strength |
| Finish | QPQ Nitride for Corrosion and Wear Resistance |
| Twist Rate | 1:7 Ideal for Subsonic and Supersonic Loads |
| Gas System | Pistol-Length for Subsonic Cycling |
| Inspection | MPI and Air Gauged for Consistency |
✅ Bloodline = battle-tested barrel construction.
📌 Available Rosco 300 Blackout Barrel Options
| Length | Gas System | Best Use |
|---|---|---|
| 8.2" | Pistol | Compact PDW Suppressed Builds |
| 10.5" | Pistol | Tactical Suppressed Carbines |
| 16" | Carbine | Full-Length Hunting or Defensive Rifles |
✅ Options for any mission-specific 300BLK rifle.
📌 Rosco 300 Blackout Suppressor Optimization
- Gas ports sized specifically for subsonic rounds
- Maintains cycling and accuracy suppressed or unsuppressed
- Reduces backpressure and overgassing
- Compatible with most suppressors and subsonic ammo brands
✅ Run suppressed with confidence — no tuning needed.
📌 Rosco 300 Blackout Barrel Installation
- Fits any Mil-Spec AR-15 upper receiver
- 0.750" gas block required
- Barrel nut torque between 30–80 ft-lbs standard
- Recommend headspacing check after installation
✅ DIY or professional install ready.
❓ Frequently Asked Questions (FAQ)
Q: Is the Rosco 300 Blackout Barrel made in the USA?
A: Yes. Every Rosco 300 Blackout Barrel is proudly made in the United States using USA-sourced materials.
Q: What twist rate is used in Rosco 300 Blackout Barrels?
A: Rosco 300BLK barrels use a 1:7 twist rate, ideal for stabilizing heavy subsonic rounds and standard supersonic loads.
Q: Are Rosco 300BLK barrels suppressor optimized?
A: Absolutely. Gas port sizes are tuned for reliable suppressed and unsuppressed operation with subsonic and supersonic ammo.
Q: What barrel lengths are available in the Rosco 300 Blackout lineup?
A: Rosco offers 8.2”, 10.5”, and 16” 300BLK barrels depending on your build needs.
Q: Can I use Rosco 300BLK barrels without a suppressor?
A: Yes. They are perfectly reliable both suppressed and unsuppressed.
✅ (Wrap this FAQ into JSON-LD for SEO-rich snippets.)
🛒 Shop Rosco 300 Blackout Barrels — Tactical-Grade Performance
Whether you're building a suppressed tactical rifle or a reliable 300BLK defensive carbine, the Rosco 300 Blackout Barrel delivers unmatched precision, reliability, and American craftsmanship.