Which should the US regulate?

Five children have been shot and killed by children so far this year (Q1).

https://www.gunviolencearchive.org/query/cf79e15e-273b-4510-9d5e-2e1febe91955

WTF do children have access to guns? Guns!
Children!
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3 mo
Six, now (and another injured).

"Young child fired an unattended shotgun and shot the two siblings."
Which should the US regulate?
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