flintlock vs scatter gun

flintlock

noun
  • A type of lock used on muskets, rifles, and pistols from the early 17th to the mid-19th century. 

  • An early type of firearm, using a spring-loaded flint to strike sparks into the firing pan. 

scatter gun

noun
  • Synonym of shotgun 

How often have the words flintlock and scatter gun occurred in a corpus of books? (source: Google Ngram Viewer )