didn't mean the question literally...kinda. I was trying to speak to the trend of most armies going to sub-machine guns sized assault rifles/pdw that still possess the ability to penetrate armor....The p-90and all these new subguns/pdw have ap ammo due to design and velocity but I guess no matter how you slice it 5.56 still get the nod as a rifle caliber..... If 5.56 had a shorter case I think it would become a subgun caliber(although a beefy one
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Basically I should have named the thread Make Room for the Armor Piercing Sub Guns