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Complete AR-15 Pistol Upper Assembly - 300 Blackout Pistol Upper (7.5" Barrel & 7" Free Floating Quad Rail)
$499.95 $429.95 (You save $70.00)
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Free Shipping on all orders $325+!


SKU: UA300PHB7.517(P)-(7)FFQ

For the AR builder who wants the most accurate, compact, functional, and lightweight pistol .300 AAC blackout upper assembly, look no further. Our 7.5" pistol upper assembly chambered in .300BLK with free float quad rail features an all mil-spec construction with classic picatinny rails that allow for plenty of attachments. With an included bolt carrier group and standard charging handle, this pistol upper ships ready to fire, no guesswork and no extra steps needed. A 1:7 twist rate and pistol gas system offers the perfect balance of stabilizing lighter supersonic 300 Blackout loads, without sacrificing the ability to reliably shoot heavy subsonic loads.

Mil-Spec Quality and Accuracy

Our .300 blackout pistol upper assembly features a mil-spec 4150 chrome moly steel barrel with M4 feed ramps for guaranteed feeding and reliability. Because our barrels do not use chrome lining, you'll enjoy superior accuracy, too. We heat-treat every barrel to a hardness rating of RC 28 to 32, creating stronger rifling that's more resistant to wear than any other barrel on the market. This negates the need for chrome lining entirely, while still providing superior durability. This upper assembly also features a standard flat top M4 receiver, housing a quality, mil-spec charging handle and chrome-lined bolt carrier group. Everything is manufactured to ISO 9002 quality control standards, ensuring the highest quality Upper possible.

300 Blackout Pistol Barrel Features:

  • .300 AAC blackout caliber
  • 7.5" with parkerized finish
  • 4150 chrome moly steel
  • Heavy profile
  • 1:7 twist rate
  • 5/8 x 24 thread pitch
  • A2 birdcage flash suppressor

300 Blackout Receiver Features:

  • 7" free flrating quad rail
  • Pistol-length gas system (0.076 Hole)
  • Low profile gas block (0.750)
  • M4 flat top upper
  • M4 feed ramps
  • Pistol gas tube
  • Charging handle
  • Chrome-lined BCG

Ships Straight to Your House!

Even though this 300 Blackout Pistol Upper ships ready to fire out of the box, there is absolutely no paperwork required! You do not need to deal with any FFL transfers and fees, and there's no waiting at your local gun store while that PICS check takes forever. The only part of your AR pistol that's considered a firearm is the stripped lower. This upper is legally not a firearm, so we can ship it directly to your front door.

No FFL Required Made In The USA Lifetime Warranty

Complete AR-15 Pistol Upper Assembly - 300 Blackout Pistol Upper (7.5" Barrel & 7" Free Floating Quad Rail)

$499.95 $429.95 (You save $70.00)
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Free Shipping on all orders $325+!

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I ordered this upper receiver only a few days ago and it was delivered to me within just a couple days! I was looking to build my very first AR pistol and I just finished my own lower and I have to say that this upper was a quality choice for my build!



This is my first 300 blackout build and I have been told by so many of my friends to go with a pistol variant and I saw this. I love this upper! I can definitely tell the parts are high quality and I can't wait to take my new build out to the range!