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					Originally Posted by dilbert firestorm  interesting video of the new M-5 rifle with its 6.8mm ammo.
 
 bet that has to do with the issues with the 5.56 ammo.
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The Video talks about the rational for the new cartridge:  
penetrating advanced body armor.  So, yeah it does have something to do with the current ammo.
They are keeping the M-4 and its 5.5 NATO cartridge though.  In talking with combat veterans from Viet Nam through the Iraq/Afghanistan wars, they say that at ranges within 300 yards (or meters if you insist) the M-4/M-16 and the 5.56   will really mess you up. The  new rifle and ammo will do that at extended ranges even if you are protected.