Ammo For Sale

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The AR-57 is an upper you put on your AR-15 so that you can fire5.7X28 ammo and use FN P90 50 round mags. Bonus cool points: Shells eject through the mag-well so a rubber band and a Crown Royal bag would make a fine brass catcher.

Discussion at

5 Responses to “Nifty”

  1. Bruce Says:


  2. Kevin Baker Says:

    Wow! Just what the AR platform needs! A cartridge even wimpier than the .223 and more expensive than the .22 magnum!

    (Still, it is cool!)

  3. Linoge Says:

    Apart from the 5.7 rounds being absurdly expensive (last I paid attention), that is relatively nifty. A straight-up PS90 wins on cool points, though.

  4. Ahab Says:

    Double want.

    I can finally have an excuse to get a Five-seveN pistol.

  5. Sulaco Says:

    +1 Kevin. The 5.7 is a .22 mag looking at the ballistics. One question for this, “WHY?”