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The 300 Blackout cartridge is perfect for the modular AR-15. It's capable of providing supersonic and subsonic performance, suppressed or un-suppressed, without modifying your weapon. But to enjoy all that performance, you need a quality 300 Blackout Rifle Kit, like these. Each one is configured to run all forms of 300 AAC Blackout, with high precision and utter reliability.

Why Our 300 Blackout Rifle Kits?

Not all AR-15s are created equal. With so many vendors and manufacturers flooding the market, it's tough to find a quality black rifle configuration that doesn't cut corners (or cost an arm and a leg). We partnered closely with OEM gunsmiths and cut out the middle men, ensuring our AR kits are affordable while providing mil-spec quality and truly great performance.

Here are just a few reasons why our kits are a great value:

  • 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

In addition to top-tier specs, we selected various lightweight and free-float handguards that provide greater accuracy with plenty of "rail" estate for all your accessories. Coupled with your barreled upper, our AR-15 kits provide the perfect balance of pre-assembled parts with the opportunity to customize your new rifle as soon as your assemble.

What's Included:

  • Barreled upper assembly
  • Lower parts kit w/ trigger
  • Full-auto BCG w/ gas key
  • Charging handle
  • Buffer, tube & stock

Receiver sold separately.

NOTE: Counter to federal law, some states have enacted certain restrictions and/or bans on gun-making kits and AR-15 kits like ours. Reference our state and federal 80% lower law guide to get an idea of what you need to know or research further before buying and building. If you're ever unsure, consult with a licensed attorney in your state.


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, 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.

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, Hawaii, 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.