GET THEM WHILE YOU CAN. I purchased the last of them from the factory. The factory discontinued the hand guard and offered these at over $100 savings. Where else you going to get an upper with a lifetime warranty at this price? 

The Radical Firearms 16" HBAR Radical Upper Receiver is a flat top, law-enforcement grade, 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, Barrel Nut. 16" HBAR Profile Barrel and A2 Flash Hider. DOES NOT INCLUDE BCG OR CHARGING HANDLE. Bolt Carrier Group and Charging Handle can be added at a discounted price. 
  • 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)
  • Direct Gas Impingement
  • Mil-Spec A2 Flash Hider
  • 15" 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