@Bobblehob:
5.56 is a rifle round. It's a medium-powered rifle round, but a rifle round nonetheless. There are some really tiny guns firing 5.56 that are being spun off as PDWs, but the recoil and magazine girth puts them outside of what I would consider (and what should be considered) PDW territory and into carbine/subcompact territory.
PDWs fire special HV cartridges, be they brand new (5.7x28mm or 4.6x30mm) or modified pistol rounds (9x18mm AP comes to mind).
It's like SMGs vs. Assault rifles. Some people call the AKS-74U an SMG because it's small enough to be one. I call these people idiots. SMGs are select-fire and take pistol cartridges, assault rifles are select-fire and fire rifle cartridges. The AKS-74U fires 5.45x39mm, a rifle cartridge.
Now, SMGs and PDWs is a grey area. All PDWs are SMGs, but not all SMGs are PDWs. Hell, PDW itself is misleading. An SMG is a class of firearm, and a PDW is a gun used for a very particular purpose. That means that, technically, anything used for personnel defence is a PDW (MP5, M4, AKS-74U, UMP,etc.). Since we now have specialized guns for this job (MP7, P90, KA PDW, PP-2000, etc.), though, PDW gets treated as a class.
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