Posession no but “brandishing” is a legitimate charge in a lot of places. Waving a gun around in a public place makes people nervous and if bystanders cant tell the difference then for the purposes of the charge you were brandishing a weapon.

Question is why tho? Is there a need to have toys look like real weapons? Especially when at the same time people also easily get real guns?

And somehow that requires more than an arrest, a court date, and being shown the door.