What is the difference between M855 and XM855 for 5.56mm NATO?

What is the difference between M855 and XM855 for 5.56mm NATO?

This is a discussion on What is the difference between M855 and XM855 for 5.56mm NATO? within the Defensive Ammunition & Ballistics forums, part of the Defensive Carry Discussions category; Does the X just mean it has the same specs, but isn't approved by the military? Does it mean it's not a waterproof bullet? Both ...

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Thread: What is the difference between M855 and XM855 for 5.56mm NATO?

  1. #1
    Ex Member Array AdBro's Avatar
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    What is the difference between M855 and XM855 for 5.56mm NATO?

    Does the X just mean it has the same specs, but isn't approved by the military? Does it mean it's not a waterproof bullet? Both have the green tip so I assume they both have steel cores. I have not shot the XM855 fyi.


  2. #2
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    X is MIL production overrun and nothing to do with if waterproof or not.
    M855 Steel penetrator tip & NOT Steel core.
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    ok, so where am i getting "steel core" from? are all green tips "steel penetrator tips"? if a round has the NATO stamp on it, is it certain to be waterproof?

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    Quote Originally Posted by QKShooter View Post
    X is MIL production overrun and nothing to do with if waterproof or not.
    M855 Steel penetrator tip & NOT Steel core.
    also m855.jpg

    from The AR15.com Ammo Oracle
    QKShooter and aus71383 like this.

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