Olympic Arms AR-15 A2 Upper Receiver Assembly 223 Remington 20" Barrel

Product #: 663709 Olympic Arms #: K2CA
Date expected in stock: Overdue
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  • Information

This A2 upper receiver comes complete with charging handle, bolt carrier assembly, fully adjustable rear sight, A2 front sight with sling swivel, fixed carry handle, bayonet lug and threaded muzzle with A2 birdcage flashhider. The 20" button rifled barrel is chambered for 5.56mm NATO and comes with a 1 in 9" twist rate for accuracy with a wide range of bullet weights. Ready to install on any normal AR-15 lower receiver. Lifetime factory warranty.

Technical Information

  • Upper Receiver Type: A2 Upper
  • Barrel Length: 20"
  • Barrel Contour: Not listed by manufacturer
  • Barrel Material: 4140 Chrome Moly Steel
  • Muzzle Thread Pattern: 1/2"-28
  • Chrome Lined: No
  • Barrel Finish: Black Matte
  • Twist Rate: 1 in 9"
  • Chamber: 5.56x45mm NATO & .223 Remington
  • M4 Feed Ramps: Yes
  • Muzzle Device: A2 Flash Suppressor
  • Gas System Length: Rifle
  • Gas Block Diameter: .750"
  • Handguard: M4 Polymer Handguards
  • Sights: A2 Front Sight, Adjustable A2 Rear Sight
  • Bolt Carrier Assembly Included: Yes
  • Bolt Carrier Type: Commercial

Please Note: Installation of AR-15 upper assemblies with certain features including, but not limited to: flash hiders, bayonet lugs, and threaded muzzles may violate state and/or local laws.

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