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I can’t see any teacher of sound mind bringing a gun into the classroom.
The teacher in in loci parenti responsibilities would be put in a liability situation that is untenable in comparison to the pay scale.

20 to 30 pairs of grubby inquisitive hands at a time, there is just tragedy waiting to be written.

Schools would need to retrofit classrooms to provide secure storage.
Schools will be forced to renegotiate property and casualty, health, and life insurance premiums with insurance carriers.
Schools will be bankrupted in court if there is just one incident of a student acquiring a qualified and insured teacher’s firearm on school grounds.

And further, the more likely a school district is in need of armed teachers, the less likely the school district is financially able to cover the increased liability costs to do so.

So even if in favor of this, it would take a very large reworking of the American school systems to make it work in practice. The legislature can pass any law they want, but unless the law includes liability waivers for school districts, the practical applicatoin of the law is going to maintain the current status quo.