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It allows the barrel to fall out when you unlock it. It's pretty much for if you have another barrel. but even if you don't have another one, it allows for much easier, faster reloads.
Looks cool, but how and where would I get the potassium nitrate without looking suspicious or something?
As for transporting the machine, it is pretty small and would be able to be transported easily. As you said, taking it apart is probably the only problem.
Circuit Board Design Class
Tools and Materials for Bread
Welcome to Bread
I can't resist making this. I'll have to find time, but this is worth it.