40mm grenade launchers are NFA items while 37mm grenade launchers are civilian legal. That 3mm difference contains a plethora of ATF retardation.

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Civilians owned warships during the 1800s, and private companies still manufacture and possess nukes despite polite society’s belief that nuke ownership is governmental. Private space lasers are protected by the 2nd amendment, but I can’t afford one or the ticket to low earth orbit (yet) . How long until blue paint requires a tax stamp?