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16" K3B Upper Receiver

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K3BUR: 16" heavy bbl upper

Availability: Available (built to order)


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The K3B upper is the staple upper for the base-line AR15's offered by Olympic Arms. Economic, yet practical and accurate, this upper comes standard with a limited Lifetime Warranty. Standard Features include:

  • Forged A2 upper receiver.
  • Black-Tac Bolt Carrier
  • Mil-spec Plus Bolt
  • 16" 4140 Chromemoly steel barrel
  • Threaded muzzle (1/2 x 28)
  • Military style A-Frame front sight base
  • Bayonet lug
  • M4 Style handguards
  • Aluminum Delta-ring assembly (not plastic)
  • 1x9" twist


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Olympic Arms, Inc. is not affiliated with the IOC/USOC or any other Olympic sports organization.