Home > PRODUCTS > UPPERS > .450 Bushmaster Complete Upper Assemblies
All Big Bore Uppers come complete with:

  • MIL-STD Charging handle
  • Big Bore BCG
  • Big Bore Magazine
Sort By:
Page of 1
Radical Firearms 16" 450 Bushmaster Complete Upper with MHR Radical Firearms 16" 450 Bushmaster Complete Upper with MHR

  • 16" 450 Bushmaster 4140V Steel Barrel
  • 1 in 14" Twist Rate
  • 5/8x32 TPI
  • Single Feed Ramp
  • .936" Micro Gas Block
  • Stainless carbine-length gas tube
  • Direct Gas Impingement
  • Radical Firearms Panzer 5/8x32 Brake
  • Radical Firearms 15" MHR Hybrid Rail System
  • Integrated M-LOK attachment points on the sides and bottom with Picatinny Rails at the fore end for Mounting Lights, Lasers, Bipods & Sights
  • Custom Forged Upper Receiver with RF Dimpled Forward Assist, Shell Deflector, Dust Cover
  • Complete 450 Bushmaster BCG, MPI, Melonite Coated, Staked
  • MIL-STD Charging Handle
  • 1 Big Bore Magazine

MSRP: $589.95

(1)
Radical Firearms 20" 450 Bushmaster Complete Upper with MHR Radical Firearms 20" 450 Bushmaster Complete Upper with MHR

  • 20" 450 Bushmaster 4140V Steel Barrel
  • 1 in 14" Twist Rate
  • 5/8x32 TPI
  • Single Feed Ramp
  • .936" Micro Gas Block
  • Stainless carbine-length gas tube
  • Direct Gas Impingement
  • Radical Firearms Panzer 5/8x32 Brake
  • Radical Firearms 15" MHR Hybrid Rail System
  • Integrated M-LOK attachment points on the sides and bottom with Picatinny Rails at the fore end for Mounting Lights, Lasers, Bipods & Sights
  • Custom Forged Upper Receiver with RF Dimpled Forward Assist, Shell Deflector, Dust Cover
  • Complete 450 Bushmaster BCG, MPI, Melonite Coated, Staked
  • MIL-STD Charging Handle
  • 1 Big Bore Magazine

MSRP: $589.95