Saturday-night special vs musket

Saturday-night special

noun
  • An inexpensive, easily obtained handgun. 

  • An unexpected takeover bid that gives its opponents little time to respond. 

musket

noun
  • A male Eurasian sparrowhawk (Accipiter nisus). 

  • A kind of firearm formerly carried by the infantry of an army, originally fired by means of a match, or matchlock, for which several mechanical appliances (including the flintlock, and finally the percussion lock) were successively substituted; ultimately superseded by the rifle. 

How often have the words Saturday-night special and musket occurred in a corpus of books? (source: Google Ngram Viewer )