Colt vs six-shooter

Colt

name
  • A male given name transferred from the surname. 

  • A surname originating as an occupation. 

noun
  • A revolver (gun) (from Colt's Manufacturing Company), associated especially but not exclusively with the American Wild West. 

six-shooter

How often have the words Colt and six-shooter occurred in a corpus of books? (source: Google Ngram Viewer )