realistically, yer only possibly problem would come from the atf (and they're probably looking for bigger offenders). we local LE's aren't too concerned about it. to me, an "evil feature" is a criminal hand wrapped around the grip or a bore axis in alignment with me. other than that, i don't care how yer guns looks. you could hang a xmas wreath around the muzzle if ya like.
i went to a call, once, (argument between roomies - one party is armed) no info avail on "armed?" we get there, homeboy's got him an AR, about 5 hicaps. it's got a laser under the barrel, a magnification scope on top, and OH MY GOD... A COLLAPSIBLE STOCK!!!!!! well, no violence or threats had occurred, he just had it in his car. i start bs'n w/him an ask "you put that stock on there" he says "yeah, i think the rifle's pre ban" LOL, nice try. i say "then why you got a neutered barell?" he's like "i still have the original stock" i say "you might wanna put it back on"
THE END, we give him his rifle back and go on to break up some other fighters.