My firearms are locked away in a safe. My single handgun is in a locked, secured compartment within arms reach of my bed. Don't get the image of an intruder coming in, then you having to go to another room to put in a safe combo, then finally grab your gun. That is hardly the case.
Bump stocks are an idea someone came up with just for the sake of it. Its one of many ways that increase rate of fire. Hell, you can just shave the sear and have an permanent auto. But nobody talks about trigger mechanisms. They just see the use of something one time, even if they've never heard of it, and assume its super dangerous. Its quite silly. As for magazine changes, we have to be realistic. Most people (especially in schools), won't even know when a magazine change is actually happening, which is why its useless. Its not like some kid is going to be like, "he's changing mags, get him!" Besides, fear generally overwhelms calm, collected thinking. If I believed any of those solutions could save even one life, I would be all for it. But I do not believe it would. Lets not forget that handguns, which have smaller standard magazines are just as common, than rifles when it comes to these shootings.