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Ultimate 300 Blackout Build Kit

$1,400.00 $1,000.00 (You Save $400.00)

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SKU: BudgetUltimate_300BLK-BK-X


Love the look of the old(er)-school M4-style rifles?  We’ve got just the thing, but with a twist.  Check out our Ultimate 300 Blackout rifle build kit.  Once completed, this kit will get ya an AR-15 that looks just like they used to when they first started makin’ ‘em with the A3 flat top upper receivers.  The only difference is, this one’s chambered in .300BLK.  That means you get a heavier load whose performance is excellent at closer ranges.

At just under $1,000, this .300 AAC blackout rifle build kit gets you almost everything you’d find on a military-issue M4: polished feed ramps, an M16 bolt carrier group, government-profiled barrel, chrome moly vanadium steel barrel, A2 fixed front sight post with carbine-length pre-installed gas system, A2 birdcage flash hider, forged upper receiver, and a mil-spec phosphate hard coat finish.

A mil-spec lower parts kit accompanies a six-position buttstock, a carbine buffer system, and a quality 80% lower.  It’s got everything needed to finish your at-home build.  This kit is 100% legal to ship straight to your front door, with no FFL transfer or paperwork needed. Nothing in this kit is considered a firearm by any state or federal law. If you were looking for the most affordable way to build a quality M4-style platform rifle, you’ve found it.

Your AR-15 Rifle Kit Includes:

  • Barrel – 16” Carbine-length, parkerized chrome moly vanadium steel chambered in .300 AAC blackout with a 1:7 twist rate (included & installed)
  • Upper Receiver – Forged 7075 aluminum (included & installed)
  • CAR-style/M4-style fixed handguard (included & installed)
  • Bolt Carrier Group (included & installed)
  • A2 Front Sight serves as the Gas Block (included & installed)
  • Gas Tube (included & installed)
  • A2 Birdcage Flash Suppressor (included & installed)
  • Charging Handle (included & installed)
  • Butt Stock & Buffer Tube Assembly (included)

Premium Accessories:

  • Magpul MBUS rear flip-up sights
  • Mil-spec buffer tube and stock kit
  • Tactical rifle sling (black)
  • Rugged tactical rifle case with customizable foam inserts
  • Easy Jig Gen 2 for AR-15/AR-9 (80% Lower Jig)
  • Easy Jig Gen 2 tooling (end mill and drill bits)

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.  Its barrel is chambered in .300BLK.

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

Ultimate 300 Blackout Build Kit

$1,400.00 $1,000.00 (You Save $400.00)

Out of stock

$1,400.00 $950.00 (You Save $450 )
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