eh... i don't see how this would work at all. I think it fails on two levels.

First, it fails to prevent shootings or violence. Shooters don't go into locations armed with "20 M-16s" and even if you assume that they DO have multiple weapons, so what? You can only shoot one weapon at a time. In a shooting, each addition gun has a marginal utility of basically zero.

Second, it punishes lawful gun collectors. The type of people that collect an "arsenal" of weapons appreciate firearms for their variety and aesthetic value. Furthermore, many gun collections are investments. Guns tend to hold their value well over time, a safe full of high-value guns is practically worth its weight in gold (well not really, but you get the point).

No one except this guy is voicing this opinion for the basic reason that it is a bonehead idea.