300 Blackout Build Kit (16" Barrel and MLOK Handguard) with AR15 Fire/Safe 80% Lower



.300 Blackout Freedom Build Kit with AR15 80% Lower

What do you do when you're looking at hunting or home defense options for your AR-15 , and you realize you need a heavier load with stopping power than the .223 or 5.56mm NATO rounds at closer to intermediate ranges?  What if the answer to that question requires a more custom job?  Simple:  you get an AR-15 chambered in .300 AAC Blackout, and you build the damned thing yourself.  Let us get you started.

The .300 AAC Blackout round (also referred to as .300BLK) is to the AR-15 what the .45acp caliber is to the handgun.  And the .300BLK cartridge is gaining popularity at wild rates.  It's a slower, heavier load, which makes it perfect for close-to-intermediate range rifle shooting.  Our .300 blackout kit is the perfect answer for anyone from beginner to certified armorer.  Mill and drill your lower receiver, install your lower parts kit, attach the .300BLK upper assembly, and you're good to go.  That's it.  All you'll have left to do is supply the mags and ammo and mount the backup sights or optic of your choice.

With your upper assembly, you get a mil-spec lower parts kit, a six-position buttstock and carbine buffer system and a quality 80% lower, everything needed to finish your at-home build! This kit is 100% legal to ship straight to your front door, no FFL transfer or paperwork needed. Nothing in this kit is considered a firearm by any state or federal law. If you're looking for the most affordable way to build a quality AR-platformed rifle with a little more punch, we've got your six.

Your AR-15 Rifle Kit Includes:

  • Barrel - 16" Carbine-length, parkerized chrome moly vanadium steel chambered in .300 AAC blackout with a 1:8 twist rate (included & installed)
  • Upper Receiver - Forged 7075 aluminum (included & installed)
  • 13.5" M-Lok free float handguard (included & installed)
  • Bolt Carrier Group (included & installed)
  • .750" Low-Profile Gas Block (included & installed)
  • Gas Tube (included & installed)
  • A2 Birdcage Flash Suppressor (included & installed)
  • Charging Handle (included & installed)
  • Butt Stock & Buffer Tube Assembly (included)

Choose Your 80% Lower:

  • 7075 T6 forged aluminum
  • 6061 Premium billet aluminum
  • No lower optional

AR-15 Rifle Kit Details (Expanded):

Upper Assembly: This upper receiver is Forged from 7075 - T6 aluminum and is hard coat anodized black for durability. Featuring M4 feed ramp cuts, these upper receivers are made in the USA.  The upper assembly comes to you pre-assembled and ready to go.  Simply mount it onto your completed lower assembly, and add the backup sights of your choice.  Since its barrel is chambered in .223 Wylde, it's made to accept both .223 and 5.56mm NATO rounds.

80% Lower Receiver: This kit comes with your choice of either a forged or a billet fire and safe-engraved black 80% lower. Alternatively, choose the "No lower" option if you already have your lower picked out.  Our lower receivers are already anodized to match the upper receiver assembly perfectly. The 80% lower is ready for you to mill the trigger pocket and drill the holes for the trigger pins and safety selector.

Please note: This AR-15 build kit requires that the builder complete the 80% lower receiver themselves, but that's the rewarding part of the experience (and the only way to build your own AR-15 without the need of an FFL transfer or serialization).

No FFL required  Made in the USA  Lifetime Warranty

Shipping Restrictions

AR-15Lowerreceivers.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally. Shipping of various parts and/or accessories are prohibited to states and locales (ie New Jersey, California, New York, etc…) with restrictions against certain parts and/or accessories (i.e. states with high-capacity magazine restrictions, manufacturing of semi-automatic weapons, etc..). It is your responsibility to be aware of your local firearms laws before purchasing from our website. We try our best to keep our shipping page current, but laws change daily.

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.