==Gallup== 
 This Wikipedia article says (in the subsection about tyranny): "a Gallup poll in October 2013 showed that only 5 percent of American gun owners own them for Second Amendment reasons".  Here is the cited source.  I intend to remove this bit about Gallup for a couple reasons.  First, it says nothing about "tyranny".  Second, it showed that 60% of people favor gun ownership for "Personal safety/Protection"; this appears to mean either "Protection" or "Personal safety" (notice the capital "P" in "Protection"), and such protection could encompass protection from tyranny.  Anyway, tyranny is not explicitly mentioned in the cited reference, so I think it's original research for us to suggest that only 5% think guns deter tyranny.