16″ 5.56 Complete Upper Assembly

(1 customer review)

Complete 5.56 16″ upper receiver assembly ready to run out of the box with any 5.56 AR-15 lower receiver. Available in multiple colors


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Angstadt Arms complete 5.56 NATO AR-15 16″ upper receiver assembly is ready to run out of the box with any AR-15 Mil-Spec lower receiver. It features the same high quality parts that go into are UDP-556 rifles.


  • 7075-T6 billet aluminum slick side upper receiver with no forward assist or dust cover
  • 16″ M4 profile barrel in chrome moly with a 1/7 twist rate, black melonite finish and a 1/2×28 thread pitch
  • M4 feed ramp extensions
  • Mil-spec 5.56 complete bolt carrier group assembly finished in black nitride
  • 15” ultralight handguard with M-LOK® mounting interface on the 3, 6, 9 & 12 O’clock positions
  • Top mil-spec 1913 picatinny rail with lightening cut
  • Angstadt Arms black nitride A2 birdcage flash hider
  • .750″ low profile gas block with carbine length gas tube
  • Mil-spec charging handle
  • Caliber: 5.56 NATO
  • Color: Available in a Black anodize finish, Magpul FDE (Flat Dark Earth) or Tactical Grey Cerakote
Weight4 lbs
Dimensions24 × 3 × 3 in

Angstadt Arms


Angstadt Arms


Black, Flat Dark Earth, Tactical Grey

1 review for 16″ 5.56 Complete Upper Assembly

  1. subaruray13 (verified owner)

    Just what I needed and Great customer service. RR

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Exceptional Firearms, Craftsmanship and Innovation

Angstadt Arms is born from a rich heritage of master gun makers, a family legacy spanning centuries, now reimagined with innovation and technology. We believe every gun owner is part of a grand story and we invite them to add a new chapter with us.

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5.56 AR-15 16" Complete Upper Assembly
16″ 5.56 Complete Upper Assembly
$595.00 Select options