Radical Firearms 8.5" 300 BLK 1:8 Pistol Length HBAR Barreled Upper - 7" M-LOK FCR Gen3 Rail

Manufactured by Radical Firearms
SKU: FU8.5-300HBAR-7FCR3
Manufactured by Radical Firearms
2 Reviews

Out of Stock

NOTE: Limit 1 per household. Quantities exceeding 1 will not allow checkout.



The Radical Firearms 8.5" 300 Blackout AAC HBAR Barreled Upper Receiver is a law enforcement grade, drop-in solution for your next AR build. Crafted with quality materials and covered by Radical’s lifetime warranty, this MIL-SPEC upper receiver provides an outstanding solution for any budget. Arrives at your door with the hard work done. Complete this build with your favorite lower receiver, bolt carrier group, charging handle, and sights, then head for the range!

The Radical Firearms FCR system is a slim handguard that provides the weight savings you want without sacrificing any of the mounting possibilities you require. This freefloat design offers a monolithic Picatinny rail and plenty of M-LOK attachment points for all your gear.

NOTE: This upper receiver has a barrel that is less than 16” in length and is intended for use in AR pistol or legal short-barreled rifle builds. Other configurations may violate Federal law.

Does not include bolt carrier group or charging handle.

  • 8.5" 41V50 chrome moly vanadium steel HBAR contour barrel
  • Chambered in 300 BLK with a 1:8 twist rate
  • 5/8x24 A2 flash hider
  • 7" Radical Firearms M-LOK FCR rail
  • Gen 3 rail mounting system
  • Made in the U.S.A. in Stafford, Texas!
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AssemblyBarreled Assemblies
Barrel ContourHBAR
Barrel Length8.5
Barrel Material41V50 Chrome Moly Vanadium Steel
BrandRadical Firearms
Caliber Gauge300 Blackout
Gas System LengthPistol
Gas System TypeDirect Impingement
Handguard7 in Radical M-LOK FCR Rail
Muzzle DeviceA2 Flash Hider
Twist Rate1:8

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see www.p65warnings.ca.gov

Ratings & Reviews

2 reviews

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No malfunctions. Great fit and finish. Unbelievable value.


Very surprised by the quality of this build. This is a great deal. Fit and finish are perfect. It fits perfectly with every lower I own: Spike’s, Aero Precision, Anderson, PSA, S&W M&P. No wobble but not overly tight. Makes me question why I have spent $1,000 plus on “Gucci” uppers.

Great upper. No malfunctions.


300 rounds, no malfunctions. Theres a couple things that stick out of this upper One being the barrel. I'm not sure who the manufacturer is but it is very nice and has a great looking nitride finish. It appears to be of higher quality than PSA and other brands at this price point. Great fit and finish. Lastly, the M-LOK rail is practically designed for a Magpul AFG Angled Foregrip. It fits like a glove and looks amazing.