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Questions & Answers
What is the thread size for flash hider? Expert Answer

The Radical Firearms RF Upper Assembly uses 5/8x24 threads and will be compatible with .30 cal muzzle devices.

by Ethan, Gear Expert, February 3, 2023
What is the thread pitch? Expert Answer

These Radical Firearms RF Upper Assembly 8.5in 300 AAC HBAR Contour uppers have a barrel threaded for 5/8x24.

by Hunter, Gear Expert, October 7, 2022
Customer Reviews
Helpful Positive Review
Optics Planet should change the product description to 1/8" twist rate not 1/7" (as of Oct 2022). The barrel on my new Radical Firearms .300 AAC BLK 8.5" upper is clearly marked "300 BLK 1/8" so I called Optics Planet to inquire. They opened an inqui...
Read More...
2/3 found this helpful
Most Recent Reviews
Radical Firearms 8.5" 300 AAC Upper by Troy, Verified Owner, April 24, 2025
Says it used, but it looks brand new.It fits and matches my Radical lowers perfectly. It's more accurate and consistent than expected.
Read All 2 Reviews
Caliber:
.300 AAC Blackout
Barrel Length:
8.5 in
Barrel Profile:
HBAR Contour
Gas System Length:
Pistol Length
Barrel Twist Rate:
1-7
Threads per Inch:
5/8x24
Handguard Type:
Free-Float
Muzzle Device:
A2 Flash Hider
Finish:
Anodized
Color:
Black
Condition:
Factory DEMO
Condition Quality:
Parts Only/Salvage
Condition Details:
Wrong Product
Gas Block Journal Size-Diameter:
.750 in
Handguard Length:
7 in
Handguard Style:
Round Rail
Gun Rail:
Magpul MOE
Additional Features:
A2 Flash Hider
Included Accessories:
7in Forward Guard Shield - FGS, EDEMO1
Barrel Material:
4140 Chrome Moly Vanadium
Magazine Included:
No
Model:
7in Forward Guard Shield - FGS

Code: 2CS-UFH-URCFH85AAC-FU8-5-300HBAR-7FGS-EDEMO-WP-F

MPN: FU8.5-300HBAR-7FGS-EDEMO1

Product No Longer Available

Product Info for Radical Firearms RF Upper Assembly 8.5in 300 AAC HBAR Contour w/ A2 Flash Hider

The Radical Firearms 8.5" Hbar profile 300 AAC Blackout is a MIL-STD upper ready to drop on any MIL-STD lower Receiver. Perfect for the novice or advanced shooter wanting to finish out that build and hit the range.Simply add your BCG, charging handle and you are ready to go. Built with our 7" free float rail system for increased accuracy and keeping your hands cool. No matter what your style of shooting is, Radical Firearms has you covered.image

Package Contents:

  • Radical Firearms RF Upper Assembly 8.5in 300 AAC HBAR Contour w/ A2 Flash Hider

Ammunition

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Related Products to Radical Firearms RF Upper Assembly 8.5in 300 AAC HBAR Contour w/ A2 Flash Hider

Radical Firearms RF Upper Assembly 8.5in 300 AAC HBAR Contour w/ A2 Flash Hider Unavailable & Discontinued Models

List of Unorderable Models

  • USED Radical Firearms RF Upper Assembly 8.5in 300 AAC HBAR Contour, 1/7 Twist, 7in FGS, MOE, A2 Flash Hider, Black, FU8.5-300HBAR-7FGS, EDEMO1, Condition Parts Only/Salvage, Wrong Product , MPN: FU8.5-300HBAR-7FGS-EDEMO1 , Code: 2CS-UFH-URCFH85AAC-FU8-5-300HBAR-7FGS-EDEMO-WP-F
  • Radical Firearms RF Upper Assembly 8.5in 300 AAC HBAR Contour, 1/7 Twist, 7in FGS, MOE, A2 Flash Hider, Black, FU8.5-300HBAR-7FGS , MPN: FU8.5-300HBAR-7FGS , UPC: 814034024563 , Code: 2CS-UFH-URCFH85AAC-FU8-5-300HBAR-7FGS
  • Radical Firearms RF Upper Assembly 8.5in 300 AAC HBAR Contour, 1/7 Twist, 7in MHR, M-LOK, A2 Flash Hider, Black, FU8.5-300HBAR-7MHR , MPN: FU8.5-300HBAR-7MHR , UPC: 816903022076 , Code: 2CS-UFH-URCFH85AAC-FU8-5-300HBAR-7MHR
  • Radical Firearms RF Upper Assembly 8.5in 300 AAC HBAR Contour, 1/7 Twist, 7in RPR, M-LOK, A2 Flash Hider, Black, FU8.5-300HBAR-7RPR , MPN: FU8.5-300HBAR-7RPR , UPC: 816903022083 , Code: 2CS-UFH-URCFH85AAC-FU8-5-300HBAR-7RPR
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