AR57 Ultra Light Tactical 5.7x28mm Complete Upper - 16"

Manufactured by PW Arms
SKU: ULT0116
MPN: ULT0116
Manufactured by PW Arms
1 Review

In Stock

Standard orders will ship out in 1 business days or less if ordered by 3:30 pm CST, Monday-Friday. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination. NFA items will take longer to ship and are dependent upon ATF processing times.

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Magazines considered High Capacity are controlled by the ATF and/or local jurisdictions are not available for purchase/shipment in all areas.



Note: This comes with a 50 round magazine. Some states have magazine limit restrictions. Know your local and state laws before ordering.

Panzer Arms AR57 Ultra Light Tactical 5.7x28mm Upper is a complete upper receiver that converts any mil-spec AR-15 lower to shoot 5.7x28mm ammunition. This alloy monobloc receiver is built with a 16-inch steel barrel, perforated muzzle brake, bolt carrier group, buffer, and screws. Designed to be simple and reliable, this complete upper has a free sliding 8620 alloy bolt that acts as the only moving element and is removable for easy maintenance. The unique design of the AR57 ULT upper makes it top loading with the spent rounds ejecting down through the AR-15 lower's magazine well. Easily add your favorite optic and accessories to the 13-slot Picatinny rail located over the operating handle or 3-slot upper and lower forward rails. The Panzer Arms AR57 Ultra Light Tactical 5.7x28mm Upper is a great option for those in the market looking to convert their AR-15 to shoot 5.7x28 ammo like the FN P-90 PDW.

  • Mates to mil-spec AR-15 lowers
  • 5.7x28mm caliber
  • 16" Steel barrel
  • 1/2x28 threads
  • 1:8.5 FN twist
  • Perforated muzzle brake
  • Bolt carrier group
  • 8620 alloy bolt
  • Buffer
  • Screws
  • Alloy monobloc receiver
  • M-LOK rail
  • Top loading with downward ejection
  • Includes one 50-round magazine
  • Aircraft grade 7075-T6 aluminum
  • Rated 83000 PSI strength

Panzer Arms is a company built on a 48-year-old tradition of designing and manufacturing high-quality rifles and shotguns. Starting with hunting rifles in the 1960s in Turkey, Panzer Arms is now bringing modern firearms to the market with innovative designs.
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Barrel Length16
Barrel MaterialSteel
BrandPanzer Arms
Caliber Gauge5.7X28mm
Muzzle DeviceMuzzle Brake
Twist Rate1:8.5
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

1 review

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So far so good 👍


Looks and feels good. Haven't shot it yet as it's been too cold recently.
<br>P90 magazines suck to load.