Well, the common-use argument pretty much covers the AR-15. It is our primary infantry rifle, it is a wildly popular civilian gun...I just can't see any kind of credible logical contortion that would say otherwise.
As more states pass more laws, the process of weeding them out and shooting them down becomes exponentially longer, more difficult, and more costly (for both sides).
That's what worries me. Winning by attrition is still winning, and I wonder if the antis aren't taking the strategy of simply trying to wear us down.