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Jim, that will be remembered at all times, and I do appreciate the reminder.
Sevens has my number--it's not so much because I NEED another shotgun (I have a 12 gauge already) but I found the idea of being able to do it interesting. Maybe it'll prove out to be impractical, but I wanted to at least investigate it as a possible project.
Re: the pressure issue, maybe I've spent too much time looking at rifle information, but it strikes me as odd that a .410 would produce as much pressure as a 12 gauge. After all, you're propelling a much lighter load at the same relative velocity, no? I'll look into high pressure steel pipe or tubing.
Last I heard, it's legal to build your own gun, and you don't need paperwork unless you plan on transferring it to someone else. I could be wrong, though.
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