300 Blackout Pistol Kit

300 Blackout Pistol Kit

Precision 300 Blackout pistols. For whisper-quiet shot placement and consistent accuracy.

Configured correctly, 300 Blackout can take out a wild hog from 200 yards with a subsonic suppressed round in a single shot. Or, it can reliably sling supersonic loads to 300 yards and beyond -- all without any modification, all tucked into a compact, lightweight package. That's what we strive to offer with every 300 Blackout Pistol Kit we make and sell.

Pistol kits purpose-built by experienced shooters.

We configure every AR kit we sell based on personal shooting experience. The guy writing these words built a titanium Form 1 can for this 8.5" nitride 300 BLK kit he now runs with 240-grain subs. Unlike so many other AR retailers, you can buy one of these 300 BLK kits confidently knowing the assembled pistol will be accurate, reliable, and enjoyable to fire.

We wrote the guide on how to build a 300 blackout.

Each kit ships with a 1:7- or 1:8-twist barrel. Both twist rates reliably stabilize supersonic and subsonic loads. The 1:7 favors subs and 1:8 favors supers. All uppers use exclusively pistol-length gas systems with 3.0-ounce Carbine buffers to guarantee your bolt never short-strokes or fails to chamber or eject a subsonic round. Lastly, we ditched the mil-spec pistol grip for Magpul's MOE Grip, which provides a more natural grip angle for these short-barreled shooters. Each kit is finished off with the incredibly reliable (and comfortable) SBA3 Adjustable Pistol Brace.

AR Kit Features:

  • No FFL Required
  • 100% mil-spec construction
  • Fully assembled upper receiver
  • Includes every part needed for build
  • Forged or billet 80% lower optional
  • Proudly made in the USA

Kit Specifications

  • All barrels are forged from MIL-B-11595 E steel (4150 or Chromoly Vanadium)
  • All stainless barrels forged from Crucible 416R steel, offering sub-MOA accuracy
  • All BCGs are M16 in profile with chrome lining and properly staked gas keys
  • All stripped upper receivers forged from mil-spec 7075 T6 aluminum
  • All buffer assemblies and lower parts kits are mil-spec in fit and finish
  • All barreled uppers are test-fired to ensure proper assembly

Legally Not a Firearm

Our 300 Blackout kits are not legally considered firearms under federal law. They ship directly to your home address like any other consumer product. Even if you select an optional 80% lower receiver (billet or forged) your kit does not require an FFL or dealer transfer for pick-up and receipt. Please note, however, some states have banned these kits and 80% lowers contrary to federal law. We cannot fulfill orders to certain states. Before ordering, please check our Shipping & Return Policy. 

Your 300 BLK pistol awaits.


DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At 80-lower.com, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

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We are a national retailer of individual components and not all products depicted on this website are legal in every state. Shipping of various products found on this website are prohibited to some states (such as California, Connecticut, District of Columbia, New Jersey, New York, Rhode Island, and Washington). The information, pictures, text or products presented on this website are not a representation by us, and should not be understood by you, that any product or completed firearm is legal to assemble or own in your state of residence. We encourage each and every builder to perform their own research about the state and federal laws that apply to them. It is your responsibility to understand the law and we encourage you to consult with an attorney or your local ATF representative.