From what I understand, someone considered importing a pistol (Onyx) - which from what I am reading on different forums was for the most part a prototype, and never offered in any real quantities, even in Poland. If that is the case, it was never going to really be available here. Since the request was submitted in November of 2011, this is just an excuse to ban cheap, plentiful ammo, at a time that is opportune for the Administration to stick it to Russia, and the American shooter simultaniously. The .223/5.56 offerings with the same makeup get exempted because the AFT can pick and choose whatever they want, the rules be damned.
Yea, the ATF DGAF about the shooting community.