‘DIY lighter-fuel rifle delivers a fusillade of earplugs…If desired, however, its regular foam earplugs can be replaced with ones that are stuffed into a short length of aluminum tube and tipped with a sharp metal point, adding a bit more punch.’ http://www.gizmag.com/lighter-fluid-fueled-shotgun/38384/ See it in action here: https://www.youtube.com/watch?v=oP9SkJreLK0
