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In theory, a spring loaded nail, a piece of the appropriate diameter metal pipe, and a shotgun shell seems like all one would need. That plus some type of handle.

NotRPB wrote: ↑Fri Jul 08, 2022 10:54 am 12 GA. PLUMBING WATER PIPES MAY SOON NEED BACKGROUND CHECKS PRIOR TO PURCHASE

Don't give the ATF any ideas. They are already trying to regulate pieces of plastic (80% lowers / Bump stocks) that are incapable of discharging a projectile.