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Compact, accurate, and ready for subs and supers.

Building a reliable 300 Blackout AR pistol that can handle both supersonic and subsonic loads means investing time and effort into picking out the perfect parts: Getting the right twist rate, gas system, buffer assembly, and barrel length. Or, you can skip all that and grab a kit like the ones we offer! We've pieced together 300 BLK pistol kits that are preconfigured to accurately shoot virtually all 300 BLK cartridges, including those as light as 110 grains or as heavy as 240 grains.

Why Build a 300 Blackout AR Pistol?

The 300 Blackout platform provides a dual-purpose cartridge: One that provides supersonic flight and medium-range accuracy with more power than 5.56 NATO, and the ability to fire ultra-quiet suppressed loads with plenty of stopping power at close range. Couple these advantages over the traditional AR-15's rounds with the fact that you only need to swap out the barrel and gas system length, and you wind up with an AR-15 that can out-shoot most .223 guns while retaining virtually all the same parts. For this reason, 300 Blackout has become a popular close-range hunting and personal defense round.

Why Our 300 Blackout Pistol Kits are Better

  • All carbon barrels forged from MIL-B-11595 E steel (4150 or Chromoly Vanadium)
  • All carbon barrels and chambers treated with Nitride (Melonite) or Phosphate coating
  • All stainless / match barrels forged from Crucible 416R steel for sub-MOA accuracy
  • All bolt carrier groups (BCGs) full-auto, staked, M16 profile, chrome-lined
  • 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

How to Complete your 300 BLK Pistol

These kits include all parts required to assemble an ar-15 pistol chambered in 300 Blackout except for the firearm component, the stripped lower receiver. You must purchase a stripped lower from an FFL, or, you can fabricate your own 80% lower for the AR-15 platform! We provide a quality selection of 80% lower receivers with available fabricating jigs with tooling to get the job done.

Not a Firearm Under Federal Law

Since our kits do not include a stripped lower receiver, they cannot be made to fire. You must either fabricate an 80% lower or purchase a stripped lower receiver from an FFL to complete assembly of the 300 Blackout Pistol Kit. However, some states have enacted restrictions that disagree with well-established ATF policy and federal gun laws. As such, some anti-gun state legislatures have banned AR kits like these. Read the restrictions on our Shipping page to confirm whether we can ship to your state before ordering.


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.

DISCLAIMER: “GLOCK” is a federally registered trademark of GLOCK, Inc. and is one of many trademarks owned by GLOCK, Inc. and GLOCK Ges.m.b.H. Neither AR-15LowerReceivers, a/k/a Tactical Gear Heads, LLC nor this site are affiliated in any manner with, or otherwise endorsed by, GLOCK, Inc. or GLOCK Ges.m.b.H. The use of “GLOCK” on this page is merely to advertise the sale of GLOCK pistols, parts, or components. For additional genuine GLOCK, Inc. and GLOCK Ges.m.b.H products and parts visit

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.