not only this, but lets be honest here, it does absolutely nothing to reduce the lethality of firearms. Even if an active shooter abides it; most people who’ve spent a modicum of time practicing can drop and replace a magazine inside of a second or two.
Also, as Upgrayedd noted… you can drive a couple hours to arizona to get them. Or, just make your own mags. it’s not hard.
I’m all for effective gun control laws… but this ain’t it.