Bipartisan Senate group proposes ‘no fly, no buy’ gun measure

[Eric the Green]

I don't think it's that difficult to define a gun that should be outlawed as an "assault weapon." Specific models should not be outlawed, and looks don't matter. A standard of how fast it fires, combined with whether it can use an extra magazine of ammunition, can be determined. The magazines can be outlawed too, along with bump stocks. Age limits for buying guns can be passed too. I think it's a question, therefore, of political decision, rather than difficulty in defining a "semi-automatic."