Indeed .. is there even clearly stated reason why barrel shroud, collapsible stock, flash hider etc. are regulated ? Or even study they play any effect ?
Mags sure are far from perfect, as they are cheap and easy to stockpile, but it's something.
Back in the 1990's it was an attempt at increasing regulations on certain semi-auto firearms without affecting them all. It also revealed how little the sponsors of the new law understood American gun owners, gun culture or gun related crime.
The AWB of 1994 was called a ban when it was largely not a ban at all. The only real ban was on importation of a small list of guns. Everything else was grandfathered in. The rest of the domestic production made small modifications to remain legal; something that should have been obvious to anyone in Congress on on this forum. But I still see from time to time about how "those guys got around the law" by just eliminating the restricted features mentioned in the new law.
Another example of how naive the bill sponsors were is that they went after what was then the guns least used (other than NFA guns) in crime. The guns most often associated with violent crime if I remember correctly were the small handguns. The AWB94 regulated large handguns and semi-auto rifles that looked like military weapons as well as some shotguns.
What part of "nothing sells like something banned" did they not understand? They need to try it with books again to see how it works.
The only ones surprised at the ineffectiveness of AWB94 were those who supported it. Anyone who read the bill or understood how guns worked were for the most part not surprised. Unless the AWB supporters eventually wanted to work their way to cover virtually all guns in the USA, the AWB94 made no sense at all.
Here is an AR-15 stripped of all offending (now and in the future) features.
The only feature left to ban is the lower receiver which is the main element of the gun. This model will still sell in the USA. Various jurisdictions have banned the semi-auto feature, the detachable magazine feature and even the gas system as a whole. But this did not stop people from legally buying them. One country even says "it looks wrong" so the guns were confiscated.
The only thing that makes any sense is the slippery slope fallacy; and that doesn't hold water very well either. The AWB's I've seen only make sense if they're eventually going after all of the guns. And this is the one thing that most gun grabbers deny they support.