To sum the story up for those that are not Norwegian
Soldiers are reporting health issues after firing the HK 416
They believe it has something to do we the new inviromental friendly ammo
Norway had a lot of the old ammo to sped before they could start to use the new ammo, the old ammo was 7.62mm NATO, and the HK uses 5,56mm NATO all of wich is lead/leed/led (not sure how to spell it) free in the Norwegian army.
The fact that the AG3 is still beeing used with the normal ammo is why this has not been reported before now
to top it of: The new ammo has so many problems that the soldiers in Afghanistan is not allowed to use it
so no need to implement the fact that the soldiers would fell ill and throw up after about five mags ingame
(I just figured it would be annying to not realize what the story was about, especially when concerning such a cool rifle as the HK 416

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And by the way Zimmer, the pic you use as sig MIGHT be copyrighted by Torgeir Haugaar. (I might be mistaken, so do not remove it before you check) but i am pretty sure, it is either he or "Forsvarets Forum" which ownes the copyright