Radical Firearms 20" .450 Bushmaster 1:14 Carbine Length HBAR Complete Upper - 15" M-LOK MHR Gen3 Rail

Manufactured by Radical Firearms
Manufactured by Radical Firearms
1 Review

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



The Radical Firearms 20” .450 Bushmaster HBAR Complete 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 and sights then head for the range!

Includes the Radical Firearms M-LOK Hybrid Rail System which offers a generous 1.8” inside diameter that easily accommodates most suppressors. Lightening cuts along the rail reduce weight and aid in rapid cooling while M-LOK mounting points and MIL-SPEC Picatinny continuous top and short bottom rails provide space for your favorite sights, optics, and accessories. Features anti-rotation tabs, non-rotating QD sling mounts, and a tough hardcoat anodized finish. 

  • 20" 41V50 chrome moly vanadium steel HBAR barrel
  • Chambered in .450 Bushmaster with a 1:14 twist rate
  • M16 cut bolt carrier group with Melonite finish
  • BCG high pressure tested and magnetic particle inspected
  • Standard charging handle
  • Custom Radical Firearms Panzer Brake
  • 15" free float Radical Firearms M-LOK MHR rail
  • Gen 3 rail mounting system
  • Made in the U.S.A. in Stafford, Texas!
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AssemblyComplete Assemblies
Barrel Length20
Barrel Material41V50 Chrome Moly Vanadium Steel
BrandRadical Firearms
Caliber Gauge.450 Bushmaster
Gas System LengthRifle
Gas System TypeDirect Impingement
Handguard15 in Radical M-LOK MHR Rail
Muzzle DeviceRadical Firearms Panzer Brake
Twist Rate1:14

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

1 review

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Had to give this product a rating. Should have been a -10 stars!


Bought one of these uppers around the beginning of the year. I'm going to chalk this one up as a learning experience. The upper did not function properly at all! Sent it back to RF, they told me there was nothing wrong with it. And that I needed to use factory ammo. I thought that was odd since I use handloads in all my firearms with no issues. I have replaced every part but the bolt carrier and the rail(which is a non issues). Finally got it to function. Just feel like I've been bent over by RF. Never again!