The problem is if you address it by any of the alternative terms (modern sporting rifle, etc.) other than the specific model when talking to the general public they will instantly label you as a fringe nut, much like people that insisted on calling french fries, freedom fries. This leaves us with the option to embrace and educate, or come up with our on term that does not sound as stupid as "modern sporting rifle", maybe something like modular expandible carbine, this term though only reall works on AR, leaving the AK partly out there.