To succeed in what you want to do, there are steps you are skipping.
First and foremost, studying the subject. You said you knew nothing, so fix that before trying to fix other things or invent a new product. Inventors do their research. Ask MadMax how long it took him to research and build his propane adaptors, I'm sure he could give you an idea or two as to what's facing you.
Second; if you design a shell, study the engineering and specs along with the way those things really work. I dont think you have. Where do you store the gas? How do you refill them? What triggers them off?
Third; the shells must fit in an existing gun. Which one? If it does not, the shell is useless.
The ball is in your court. Dont get upset, just think about it some more.
By the way, this is would be an ACCESSORY. You may want to ask a moderator to move this thread to that section.
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