Home > AR-15 > AR-15 Upper Assemblies > 12.7x42 .50 Cal. AR-15 Upper Assemblies
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  • 10.5" 12.7 x 42 4150 Vanadium Steel Barrel
  • 1 in 20" Twist Rate
  • 49/64 x 20 TPI
  • 12.7 x 42 Chamber
  • HPT/MPI
  • M4 Feed Ramps
  • Low Profile .936" Micro Gas Block
  • Stainless carbine-length gas tube
  • Direct Gas Impingement
  • Radical Firearms Panzer 49/64-20 Brake
  • Radical Firearms FHR Hybrid Rail System
  • Custom Forged Upper Receiver with Forward Assist, Shell Deflector
  • Complete 12.7 BCG, MPI, Melonite Coated, Staked
  • Mil-Spec Charging Handle
  • 16" 12.7 x 42 4150 Vanadium Steel Barrel
  • 1 in 20" Twist Rate
  • 49/64 x 20 TPI
  • 12.7 x 42 Chamber
  • HPT/MPI
  • M4 Feed Ramps
  • Low Profile .936" Micro Gas Block
  • Stainless carbine-length gas tube
  • Direct Gas Impingement
  • Radical Firearms Panzer 49/64-20 Brake
  • Radical Firearms 15" FHR Hybrid Rail System
  • Custom Forged Upper Receiver with Forward Assist, Shell Deflector
  • Complete 12.7 BCG, MPI, Melonite Coated, Staked
  • Mil-Spec Charging Handle


  • *Does not include dust cover