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Radical Firearms 8.5" 300 AAC Blackout Radical Upper with 7" FQR
Radical Firearms  8.5" 300 AAC Blackout Radical Upper with 7" FQR

MSRP: $289.95

Stock Status:Ready to build; check lead times
Availability: Current Production Time Up To 4 Weeks
Product Code: FU8.5-300HBAR-7FQR


Charging Handle*:

Muzzle Options*:

***Please select your options on the right hand side for BCG, Charging Handle, and other choices. Due to an overwhelming amount of orders for this product. Build time could be 3-5 weeks. Please be conscious that we are doing everything we can to get orders out before this time frame.

The Radical Firearms 8.5" M4 Upper Receiver is a flat top, law-enforcement grade, drop in receiver, ready to be mounted to any Mil-Spec AR-15 lower receiver! This fully mil-spec compliant receiver provides a high-quality upper for any level budget or shooter. Comes complete and assembled with Upper Receiver, Forward Assist, Ejection Port Door, Barrel Nut. 8.5" HBAR Profile Barrel and A2 Flash Hider. Bolt Carrier Group and Charging Handle are additional and are offered at discounted prices in the drop down menus.

  • 8.5" HBAR Melonite Barrel
  • 4150 V Chrome Moly 1 in 7" twist rate
  • 300 AAC BLACKOUT Chamber
  • 5/8x24 Thread Pitch
  • M4 Feed ramps
  • Low Profile Micro Gas Block
  • Stainless pistol-length gas tube
  • Direct Gas Impingement
  • Mil-spec A2 Flash Hider
  • Radical Firearms Free Float 7" FQR (Quad Rail)
  • Forged Upper Receiver with Forward Assist, Ejection Door and Shell Deflector
  • Made in Houston, Texas U.S.A.
  • All 300 Uppers are test fired in-house with one subsonic and one supersonic round before we ship. We ensure your upper will cycle with subsonic rounds as this is a problem in 95% of the other uppers on the market.


    Average Rating: 4.5 of 5 Total Reviews: 2 Write a review »

      0 of 0 people found the following review helpful:
    Awesome Blackout upper! February 9, 2018
    Reviewer: Casey Davis from Jennings, LA United States  
    300 blackout I purchased really functions awesome. My only complaint was that the barrel nut was over tightened, to change the hand guard out. But I guess its better than it being loose. This is a great product and good quality I expected from deep south gunsmiths. Thanks Radical!!

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      2 of 2 people found the following review helpful:
    0ne year review November 20, 2016
    Reviewer: Martin Cheaney from TX  
    I have had my Radical upper now for a year. I still am amazed at how good of a deal I lucked into. At the time, I didn't know anybody who had used Radicals' products. I am glad I did. My upper has shot everything I have fed it reliability. Both super and sub. Supressed or with a compensator. Amazing considering that I have uppers that cost me 3-4 times as much that will only work reliability with certain ammo, or not cycle at all without a can. The only reason I cant give 5 stars is that two of the screws that hold the forward grip were stripped when I recieved it. I put lock tight on them and have had no "play" at all; despite some pretty rough use. I did read a couple other reviews of other people getting simular problems with theirs. Hopefuly they have this improved this by now. I think that for this price, awesome! I don't think you can get a better upper.

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