Get the Best 300 Blackout Barrel for Your Next Build

Looking for the perfect 300 Blackout barrel for your AR-15 platform? Whether you’re building a suppressed CQB rifle, a hunting carbine, or a tactical do-it-all setup, selecting the right barrel is crucial to maximize performance.

At Mounts Plus, we carry the best selection of 300 Blackout barrels designed for precision, durability, and reliability. Available in a variety of lengths, finishes, and profiles, our barrels come from trusted brands like Faxon Firearms, Rosco Manufacturing, Odin Works, Seekins Precision, and Q.

Short barrels. Suppressor-ready designs. Superior accuracy.
Find your next 300 BLK barrel right here.

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Why the 300 Blackout Barrel is a Game-Changer for AR-15 Owners

Originally developed to deliver optimal ballistic performance in short-barreled rifles (SBRs) and suppressed setups, the 300 Blackout (300 BLK) cartridge thrives with the right barrel.

Here's why smart builders choose 300 BLK:

• Full Powder Burn in Short Barrels: Achieve maximum velocity with 8–10.5" barrels.
• Subsonic/Supersonic Flexibility: Easily switch between whisper-quiet subsonic rounds and hard-hitting supersonic loads.
• Suppressor Compatibility: 300 BLK excels when suppressed, reducing sound and recoil dramatically.
• No Special Magazines Needed: Use standard AR-15 magazines with 300 Blackout ammo.
• Minimal Modifications: A barrel swap and proper 300 BLK upper are all you need.

A premium 300 Blackout barrel unlocks the true potential of your rifle.

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Our Top 300 Blackout Barrel Choices

1. Faxon Firearms Duty Series 16" 300 Blackout Barrel

• Government profile for enhanced durability
• 4150 CMV steel with QPQ nitride finish
• 1:8 twist rate — perfect for all 300 BLK bullet weights
• Threaded 5/8x24 for muzzle device or suppressor

2. Rosco Manufacturing Bloodline 16" Heavy Barrel 300 Blackout

• Heavy profile for improved heat management
• 1:8 twist rate
• Melonite finish for superior corrosion resistance
• Trusted by law enforcement and tactical professionals

3. Seekins Precision 8" Stainless 300 Blackout Barrel

• 416R stainless steel for match-grade precision
• Pistol-length gas system optimized for subsonic
• Ideal for suppressor use

4. Q Honey Badger 7" 300 Blackout Barrel Assembly

• Legendary design optimized for ultra-compact suppressed builds
• 1:5 twist rate to stabilize heavy subsonic projectiles
• Proprietary lightweight contour

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Choosing the Right Barrel Length for 300 Blackout

▶ Pro Tip: 300 Blackout shines with 8–10.5” barrels for home defense and suppressor builds, but 16” barrels deliver full rifle power for hunters.

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300 Blackout Barrel Finishes – What’s Best?

• Nitride (QPQ Melonite):
  ➔ Most durable, low-maintenance, corrosion-resistant, black finish.

• Stainless Steel (416R):
  ➔ Highest precision, great for target shooters, but requires more maintenance.

• Chrome-Lined:
  ➔ Best for high-round-count combat or duty rifles.

At Mounts Plus, you’ll find barrels in all three finishes — matched to your performance needs.

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FAQs About 300 Blackout Barrels

What barrel length is best for 300 Blackout?

For suppressed and short-barrel setups, 8”–10.5” is ideal. For maximizing supersonic velocities and range, a 16” barrel is perfect.

Can I use my regular AR-15 lower for a 300 Blackout build?

Yes! 300 Blackout is designed to work with standard AR-15 lowers. You only need a 300 BLK chambered upper and barrel.

Is a 1:7 or 1:8 twist rate better for 300 BLK?

Both are excellent. 1:7 handles heavier 220+ grain subsonic loads better, while 1:8 offers great versatility for supersonic and subsonic rounds.

What gas system length should I choose for a 300 Blackout barrel?

• Pistol-length gas systems work best for most 300 BLK barrels under 12 inches.

• Carbine-length gas systems are common for 16-inch barrels.

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Shop the Best 300 Blackout Barrels at Mounts Plus

Ready to build or upgrade your AR-15 with the perfect barrel?
Mounts Plus has the best 300 Blackout barrels from the most respected manufacturers — in stock and ready to ship fast.

Get superior accuracy, better suppressed performance, and unmatched versatility with a new 300 Blackout barrel today.