The whole gas seal thing seems complicated and unnecessary if it's going to be fired from a tripod. If you just put some spade grips on it, all of your body parts would be out of the way and it would save a ton of machine time.
Does the harmonica really need to feed horizontally? If it moved vertically, gravity would help, although you'd need Bren style offset sights.
I've had some similar thoughts about an automatic harmonica gun. What I've been thinking about is a scaled down version using bb's and those plastic strips of 209 primers.
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