http://www.michaelbrowntoday.com/2013/01/senator-feinstein-dhs-want-to-ban-and-buy-the-same-firearm/
mentions a Request For Proposal (RFP) from Homeland Security for 7000 Personal Defense Weapons (PDW) and 70,000 standard (30 round) magazines suitable for personal defense in close quarters. Except for the select fire option, these seem to be the same type of weapon that DiFi says have no use for self defense.
PDW seems like a good descriptor.
WIDOW MAKER