i had a few empty 5.56cal bullet cases and seen some converted to whistles so thought id have a go my self. the reed is made from old rimfire cases with a flattened section of rimfire case soldered on to cover half the hole you blow through. very loud and shrill! gave the neighbors grief all day yesterday testing them
![](http://i1236.photobucket.com/albums/ff443/mark22c/whistleselection.jpg)
![](http://i1236.photobucket.com/albums/ff443/mark22c/whistleselection.jpg)