Diddley Bow by Deadfinger Diddleybows. 

A Diddley Bow is a one stringed instrument designed to be played with a slide or Bottle neck . This instrument is made from a genuine vintage gun stock which I have added a neck to create a unique Diddley bow , an angle has been created on the headstock of the neck to allow the correct tensioning of the string , Stainless steel fret markers have been fitted on the neck . this REALLY does play and sound well , the output jack is housed in the shoulder pad of the gunstock , the bridge is hardwood and in the shape of a bullet. The instrument is wired with a standard 1/4 inch guitar output and piezo pickup and does need to be plugged into an amp to get the best effect, sounds real "bluesy" when played... The neck has a machine head tuner in chrome . This instrument has been built to be played and has a lovely tone or even can be used as a cool decoration . Check out an example of one of my Gunstock Diddleybows being played at https://www.youtube.com/watch?v=ERlGODQVdTk.