Guns are definitely allowed in the classroom so you can show the students different action types, for example.
FWIW when I taught for a bit, I never asked if anyone had a gun on them. First, in MA it's unlikely in a basic LTC class; second, if I don't ask then no one has to lie.
I witnessed this in Arizona a few weeks ago. Truck pulled over on the side of a fairly busy road and driver was standing next to it aiming a rifle. The funny bit was that she was wearing camo as if there wasn't a big truck two feet away.
Having recently gone down the rabbit hole of legal cases involving "hair triggers", I wouldn't change the trigger on a carry gun at all. If you can't find a free state version of an M&P, buy a different gun.
I don't think it's for the same reasons. The concern with shooting .22lr at longer distances is that it'll hit the ground and ricochet up and over the berm. With full auto the concern would be recoil driving the muzzle up and sending bullets too high.
That being said, I do agree that .22lr...
I don't think you need anyone else's help to form opinions about people you meet. We're not in a sewing circle here.
It's just like every time I've started a new job, there was someone who loved to gossip and would try to "warn me" about so-and-so. I always dismissed those comments. I'd rather...