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AR-15LowerReceivers.com – 80% Lowers, 80% Lower Jigs & AR-15 Parts

300 Blackout Upper

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300 Blackout Upper

300 AAC Blackout is an incredibly versatile cartridge. It’s capable of ringing targets at 300 meters while operating with near silence when suppressed. You need a high-quality, complete 300 Blackout upper to truly take advantage of it.

Shooters love 300 BLK because they can easily swap out supersonic rounds for subsonic without modifying their pistol or rifle. With the right 300 Blackout upper, that switch is as simple as changing magazines!

Features and specs:

  • Requires no FFL or paperwork for shipment!
  • Configured for super and subsonic 300 BLK
  • Includes carbine or pistol gas system
  • 7075 forged T6 upper receiver
  • 4150 CR-V or 416R stainless barrel
  • Button rifled for precision
  • M4 feed ramps for reliability
  • Includes F/A bolt carrier group
  • Optional 80% lower w/ purchase!

Made in the USA, Lifetime Warranty

With so many AR-15 uppers on the market, it’s tough finding one that’s affordable, but not cheap. We only use the highest-quality 4150 Chromoly or 416R stainless steel when we build each barrel. With the right skill, you can hit sub-MOA accuracy with our uppers.

Each of our uppers ships complete and ready-to-fire out of the box. Every upper is also backed by a Lifetime Warranty.

Configured for super and subsonic

We took the time to ensure each 300 Blackout upper we sell is capable of handling 300 BLK suppressed or un-suppressed. Every upper features a carbine- or pistol-length gas system to ensure reliable cycling with either load.

We include standard 5/8 x 24 threads with each barrel, making installing or removing your favorite suppressor a breeze.

No FFL required for shipment

No parts in any of our 300 Blackout upper kits are considered a firearm by the ATF, so they ship directly to your front door! Even if you pick up an 80% lower with your upper, the ATF considers them receiver blanks — not firearms.

That means you can legally build your AR at home with no FFL requirements, no paperwork, and no federal bureaucracy. Before building, check your local and state laws, too.

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