Brownells 75th Anniversary - A Shooting Heritage
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Radical Firearms 300 Blackout 16" HBAR Radical Upper Receiver is a flat top, 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, and Barrel Nut. 16" HBAR Profile Barrel and A2 Flash Hider.

  • 16" HBAR Melonite Barrel 4150V Chrome Moly
  • 1 in 8" twist rate
  • 300 AAC BLACKOUT Chamber
  • 5/8x24 Thread Pitch
  • HPT/MPI
  • M4 Feed ramps
  • Low Profile Micro Gas Block
  • Stainless pistol-length gas system (this will cycle subsonic loads)
  • 12" Free Float Radical Firearms Free Float Rail
  • Integral Hybrid Keymod and Picatinny Rail for Mounting Lights, Lasers, Bipods & Sights
  • Forged Upper Receiver with Forward Assist, Shell Deflector


Big Book Catalog, Issue:72, Page:006

RADICAL FIREARMS - AR-15 16" UPPER ASSEMBLY 300 BLK HBAR HYBRID RAIL NO BCG OR CH

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Cartridge: 300 AAC Blackout

Finish: Black

Style: Assembled

Contour: HBAR

Length: 16

Twist: 1-8