Learn more about the current version of the Green Bullet, the 520DX: http://www.shure.com/americas/product... The Green Bullet, also known as the model 520, was released in 1949 as a two-way radio microphone. But it soon became a favorite of harmonica/blues harp players. It’s been in the studio with the Rolling Stones and on TV with M*A*S*H. Hear from award-winning harmonica musicians Sugar...