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ar57

The AR-57, also known as the AR Five Seven , is available as either an upper receiver for the AR-15/M16 rifle or a complete rifle, firing 5.7×28mm rounds from standard FN P90 magazines. It was designed by AR57 LLC was produced by AR57 of Kent, Washington, USA. The company is now defunct. The AR-57 PDW Upper is a new design on AR-15/M16 rifles, blending the AR-15/M16 lower with a lightweight, monolithic upper receiver system chambered in FN 5.7×28mm. This model is also sold as a complete rifle, supplied with two 50-round P90 magazines. The magazines mount horizontally on top of the front handguard, with brass ejecting through the magazine well. Hollow AR-15 magazines can be used to catch spent casings.
Unlike the standard AR-15 configuration which uses a gas-tube system , the AR-57 cycles via straight blowback. A full auto version exists and was marketed as a competitor to the P90 and other personal defense weapons.

View More On Wikipedia.org
Recent contents
  1. Badb57

    AR57 5.7X28mm 6" SBR Upper - Accepts FN P90 5.7 Mags

      1. For Sale
    • $650
    • Hillsboro
    • Oregon
    5.7X28mm AR pistol/SBR upper - 6" fluted barrel w/1/2X28 threads - Suppressor ready - Accepts suppressors 1.25" in diameter or less - Ambidextrous mag release/charging handle - Includes (1) FN 50rd magazine fits any ar lower Excellent condition 675.00
  2. Hunter340

    AR57 upper 16” 5.7x28mm

      1. For Sale
      2. For Trade
    • $800
    • Centralia
    • Washington
    AR57 16" rifle length complete upper with side charging handle, BCG, buffer, and spring. 5.7x28mm In great shape and all original configuration Very low round count, comes with one 50rd FN mag and 50rds of ammo. Pretty hard to find $800 obo, open to trades what you got.
  3. H

    (PRICE REDUCED)RARE AR57 5.7x28, Aero Lower, 3.5# trigger, Burris 3x prism

      1. For Sale
    • $1200
    • Bonney Lake
    • Washington
    1st Gen AR57 upper made right here in Auburn, WA. Uses 50rd p90 mags, fluted 16" barrel, ambidextrous side charger, ambi safety, 3.5# match trigger, photos show green stock but comes with matching black stock, also comes with a Burris 3x prism optic which has a really nice field of view and...
  4. TheRealMP

    AR 57 FSS Hurricane upper

      1. For Sale
      2. For Trade
    • $900
    • Olympia
    • Washington
    Upper only. Optic, light and lower are not included. 3 magazines for non WA residents. I have a 10” AR 57 barrel. Upper has less than 250 rounds through it. Live all of your call of duty LARP dreams with the FSS Hurricane
  5. wsu 5.9er

    AR57 16" complete upper receiver group, NOS

      1. For Sale
    • $800
    • Auburn
    • Washington
    AR15 complete upper receiver group from AR57. This is the original, forged complete upper receiver with full picatinny rails. Chambered in 5.7mm, with a 16" barrel and compensator. Uses P90 mags, ejects spent cases downward just like a P90, has side charging handle. Just drop it onto your AR15...
  6. tbrandt

    AR57 short barrel upper

      1. Want to Buy
    • Eagle point
    • Oregon
    Title says is all. Looking for an AR57 short barrel upper. Please pm me if you’ve got one to let go of.
  7. Jimmy James

    AR57 Upper Receiver or Complete Rifle or Pistol 5.7x28

      1. Want to Buy
      2. Want to Trade For
    • Bothell
    • Washington
    Looking for AR-57 in 5.7x28 any form or generation. Looking for either just a upper or a complete rifle. Gen 1 or 2 , LEM or not. Willing to pay the price or trade. I have plenty to trade. AR Fifteen.
  8. Bornlifted

    AR57

      1. Want to Buy
    • Hillsboro
    • Oregon
    Looking for an AR57 upper. Please let me know what you have.
  9. W

    WTS OR  Ar57

    selling my ar57 yhm lower and truglo dot sight with extra 30 round mag asking 800.00 1-five4one-515-0823 Will ship to ffl of your choice.
  10. Chuckrizzo

    Ar57 upper 5.7x28 !!!

    Hey fellas, just wanted to pass on a little info I found out yesterday... so I have a fn 5.7 pistol and was thinking of getting ps90 but they are pretty spendy and hard to find... found out yesterday they make ar57 uppers that fit on ar15 lowers for about half of buying a ps90 ... I'm getting 1...
  11. wired

    Newest addition to the family

    Ive been accelerating my stamp collecting in anticipation of 41P ( Like everyone else ) . Not that I can't get one signed by the CLEO its just that I don't want my face to be one that the local fuzz recognize. In any case this is my 9th of the year. Been really stepping it up with the SBR's in...
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