What is the status of unloaded or dummy grenades, artillery shell casings, and similar devices?
Unloaded or dummy grenades, artillery shell casings, and similar devices, which are cut or drilled in an ATF approved manner so that they cannot be used as ammunition components for destructive devices, are not considered NFA weapons.
Source ATF: https://www.atf.gov/firearms/qa/what-status-unloaded-or-dummy-grenades-artillery-shell-casings-and-similar-devices
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