Features:
  • Obsidian Arms Forged Big Bore Upper Receiver: With forward assist or Slick Side without forward assist
  • Obsidian Arms 15" Handguard: KeyMod Full Rail or KeyMod Competition Rail
  • Satern 16" Barrel: .450 Bushmaster, .458 SOCOM, or 12.7x42mm
  • Obsidian Arms Colossus Brake
  • Charging Handle
  • Complete Bolt Carrier Group
  • Colors: Black (Hard Coat Anodized), Flat Dark Earth (Cerakote), or Olive Drab Green (Cerakote)