1.  Sales are currently NOT allowed over the internet, as only FFLs are allowed to mail / ship firearms (other than for repairs to the manufacturer).  Advertising on the internet is allowed, but any interstate sale is also required to go through FFLs and obey the sales rules in both states, as well as federal rules.
2.  There is no "Charlestown Loophole".  The remainder of the process is that if the delayed check is a refusal, the ATFE is notified to confiscate the firearm.  To institute a "no buy until completed" scheme was specifically rejected by Congress because of the potential for abuse by an administration that wanted to cut off all sales by simply not conducting checks.
3.  The DOJ conducted a study to identify the effects that the "assault weapons ban" had on crime and violence - their study showed that the ban had had NO EFFECT whatsoever.  
4. HRC has specifically stated "The Supreme Court got it wrong on Heller" - the decision that confirmed the 2nd is an individual right.