Radical Firearms 16" 300 BLK 1:8 Pistol Length HBAR Complete Upper - 15" M-LOK FCR Rail

Manufactured by Radical Firearms
3 Reviews



In Stock

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The Radical Firearms 16" 300 BLK HBAR Complete Upper 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. Finish the build with your favorite lower receiver 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.

  • 16" 41V50 chrome moly vanadium steel HBAR barrel with Melonite finish
  • Chambered in 300 BLK with a 1:8 twist rate
  • M16 cut bolt carrier group with Melonite finish
  • BCG high pressure tested and magnetic particle inspected
  • Standard charging handle
  • 5/8x24 A2 flash hider
  • 15" Radical Firearms M-LOK FCR rail
  • Made in the U.S.A. in Stafford, Texas!


Barrel Length16
Barrel Material41V50 Chrome Moly Vanadium Steel
BrandRadical Firearms
Caliber Gauge300 BLK
Gas System LengthPistol
Gas System TypeDirect Impingement
Handguard15 in Radical M-LOK FCR Rail
Muzzle DeviceA2 Flash Hider
Twist Rate1:8

Ratings & Reviews

3 reviews

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Just buy it. You won’t regret it.

by -

Great buy. Very nicely put together. Tight groups,soft shooter. Plus a small M-Loc Rail at a good price. What more do you want.

Well worth it


This is the second complete upper from Radical Firearms that I've Purchased. The first was the 223 Socom Upper and then a 300 Blackout. Both are super accurate and reliable. Thank you Radical and Primary arms for making products that not only perform, but are affordable.

Excellent Upper


Excellent fit and finish, very accurate with 168 and 175 gr. handloads. Would like to see a 20 in barrel listed