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Rifle Build Kit (Complete) – 300 Blackout (16″ Barrel, Free Float Quad Rail) AR15

$650.00 $550.00 (You Save $100.00)

Rifle Build Kit (Complete) - 300 Blackout (16" Barrel, Free Float Quad Rail) AR15
Rifle Build Kit (Complete) - 300 Blackout (16" Barrel, Free Float Quad Rail) AR15
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Free Shipping on all orders $325+!

SKU: UA300CHB1618(P).750-(10)FFQ_Budget


If you’re an AR builder looking for the perfect combo of quad rail handguard on a rifle chambered in .300BLK, look no further. Our complete .300 AAC blackout rifle build kit features a heavy, quality barrel made from 4150 chrome moly steel and carbine-length quad rail handguard, which houses a carbine-length gas system. This unique setup allows you to easily switch from supersonic to subsonic loads without the need to swap gas systems or barrels. The simple but proven design of the quad rail offers plenty of space to mount attachments like lasers, tac lights, etc.

Even though our .300 AAC blackout build kit is affordable, it’s not cheap. The whole thing’s built with mil-spec ratings and features, including a 4150 chrome moly barrel that promises 1 MOA of accuracy at 100 yards.  It’s also got M4 feed ramps, M4 flat top upper receiver, A2 birdcage flash hider, and of course, a near replica of the military’s tried and true KAC RAS quad rail system. Unlike the military’s version though, our quad rail is free-floating, which provides more accuracy than a fixed handguard.  Plus, everything is made here in the USA to ISO 9002 quality control standards.

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)
  • Free float quad rail 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.  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

Rifle Build Kit (Complete) – 300 Blackout (16″ Barrel, Free Float Quad Rail) AR15

$650.00 $550.00 (You Save $100.00)

$600.00 $500.00 (You Save $100 )
Save For Later
Save For Later

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