Not OP, but, 'assault-style' is meaningless. Who cares that it -looks- like a black rifle, it's just a semi automatic rifle. Many airsoft and paintball guns look similar, are they also 'assault-style'? A lot of damage was done with the Mini 14, which I'm guessing nobody classifies as 'assault-style', or do they? The only difference is that one is wooden, and the other is metal/plastic, really. So when you boil it down to those differences, it seems rather silly.
If you are taking the stance of banning something, then one should be well versed to know what they are seeking to ban. Banning 'assault-style' is useless (see Mini 14). If you want to ban semi automatic rifles, say that. If you want to ban high capacity magazines, say that.