Isn't 72 hours enough time for the government to put forward evidence as to why someone is too dangerous to buy a gun? A lot of people on the No-Fly List are just unfortunate to share the same name as a terrorist. Is that enough reason to punish them?
I can think of at least nine people who would tell you that
72 hours is not enuf time for a background check. Or at least they would if they were still living. If you don't want people inconvenienced when buying a gun (or flying), then hire more people to do background checks, not place an arbitrary time limit on safety.
That really is one of my biggest beefs with Republicans these days. Because "government is inefficient" they cut staffing budgets and then use the resulting snafus to prove their point.