ALBANY, N.Y. (AP) — New Yorkers under age 21 will be prohibited from buying semiautomatic rifles under a new law signed by Gov. Kathy Hochul. The Democrat signed 10 gun-related bills on Monday as the state became one of the first to enact legislation following a wave of deadly mass shootings. One law will require microstamping in new firearms, which could help law enforcement solve gun-related crimes. Another revised the state’s “red flag” law, which allows courts to temporarily take away guns from people who might be a threat to themselves or others.