WRT the airsoft, that is where the threshold of 366+ fps comes in. That is the speed that the firearms lab has determined can cause serious bodily harm, and is therefore legal to have without controls.
Re the transportation of replicas, note that the transportation requirements are actually greater for a replica than the requirements for a real gun. You can have a real rifle (non-restricted) in the front seat with you, the only requirement being that it is unloaded.
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