I read the term "needle gun" all of the time, and finally discovered that it was an early term used for the Trapdoor Springfield Rifle. They long firing pin was called the needle.
Then I read that all rifles, fired by the use of a firing pin were also called needle guns. Someone described the rifle that Buckshot Roberts used to kill poor Richard Brewer as a needle gun. It was one of those fancy officer's model Trapdoor Springfields.
Does anyone have any additional info on Needle Guns? Did the term apply to pistols as well? Did a needle gun have to be a center fire?
I'm curious about the term.