My ex-spouse just bought airsoft guns for my children, ages 7 and 9. Is this legal / appropriate / actionable?
I am not familiar with what an air soft gun is, but would assume it is legal. If you are concerned about your ex’s ability to care for the children, an or supervise them appropriately you may file a motion (if you have an order in place) in which you address your safety concerns.
What kind of motion would I file?
A motion for judicial assistance to determine whether or not the children are begin properly cared for.
Is this something I would be able to file and handle on my own, without a lawyer?
Yes, any party can act pro se (with out a lawyer).