I read that specific PDF before making my original post, but I see why my post may have been unclear. I wasn’t saying that one rifle with a pistol grip has nothing in common with another rifle with a pistol grip - that’s not true because obviously they’re both rifles with pistol grips. What I was saying is that a rifle with a pistol grip and a pistol with a threaded barrel (but not a pistol with a pistol grip) have nothing in common beyond their association with the military.
Some of the banned features do make weapons easier to handle in close-quarters environments, but not more so than other weapons (semiautomatic pistols) which are legal and clearly protected by the second amendment as it is currently interpreted.
Pretty much everyone including me is horrified by school shootings, and the implication that I’m somehow insufficiently horrified by them would be offensive if it weren’t ridiculous. I’m still comfortable arguing against this law because I expect it to have no effect on how many school shootings take place or on how deadly each shooting is. (Maybe the limits on magazine size would help, and so I haven’t brought them up. Otherwise I think no gun control law much less strict than a ban on all semi-automatic weapons including pistols with no grandfather clause for weapons which people already own would do much at all.)