maryland tries to define compressed air as a rifle. but i think the main issue is that maryland takes extreme offense to amazon drivers putting around with anything remotely close to a weapon.  a relative of mind once ordered slugs for an air gun and because they wanted them delivered in maryland it took all of 2 months to get delivered. i imagine some poor atf or post office worker who ships ammunition and explosives in maryland had to spend 30 minutes doing paperwork on air gun slugs and necked from the embarrassment. so it probably took 2 months to find a replacement.
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