The term 'SMALL GUN' can be summarized by two crossword solutions: DERRINGER (9 letters) and PISTOL (6 letters). A DERRINGER is a type of small, short-barreled handgun that was popular in the mid-19th century. It is typically used as a concealed weapon due to its small size. A PISTOL is a type of handgun that is larger than a DERRINGER but still smaller than a typical rifle or shotgun. Pistols are often used for self-defense and target shooting.