Zero and crew aren't running around with these things shooting people haphazardly either. These are a essentially a working prop that is used for a very specific purpose. It's not like it's their primary.
I bought one of his mortars and the styrofoam shell works very well and shoots far. They are reasonably priced as well if you consider what an AEG costs.
Don't try and re-invent the wheel, you want something that is constructed well, works great, and is easy to reuse...this is it.
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