Sorry to get technical, especially where it may give cover to "them", but a PDW is, in fact a class of weapon. A rifle has a barrel of 18"+ inches, a carbine down to 16", and a PDW is typically 10" - under 16". Shorter bbls are classified as pistols, even though some AR receivers are still chambered for rifle cartridges.
That crap notwithstanding, it's still a glaring example of a)Hypocrisy and b)One hand not having a clue as to what the other is doing. Although I'd concede that, considering the mass purchases of ammo by all the cabinet agencies, it's at least a tacit, unspoken plan for when the bell sounds.