Of course, don't mistake the trigger for a spit valve.
Using the barrel for a horn, an English musician can play bugle calls on a rifle. A trumpet mouthpiece is inserted into the muzzle and the bolt removed. The notes produced are shrill and piercing, but are said to be perfect in both tone and pitch. The originator of the idea is shown in the photograph reproduced at the left holding the novel instrument in the correct position for sounding a bugle call.
Earlier experiments included using your shoulder for a violin, your tendons for strings and your Army issues bayonet as a bow. Although the notes produced were shrill and piercing, they were said to be perfect in both tone and pitch.
Rifle Barrel Becomes Bugle for Musical Stunt (Mar, 1938) [Modern Mechanix]
