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For a home-brew design. I think it would be easier/more suitable to create some kind of gas unit. Instead of trying to create a shell that will contain gas.
Are you planning on building your own shotgun to integrate this system?
Also, nobody can say this guy has failed. All he has shown is an idea and a diagram. Sure these things happen a lot, and we usually never hear about them. But people have built AT-4's and other strange devices in the airsoft community.
Don't let some malicious/useless response get you from creating your ideas.
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