They're not a very acccurate reflection. For one, their demographics are very different.
> then that would reduce support on HN even further than I estimate above.
Reduce support for what? My claim suggests that the more folks know about US gun laws, the less they support current law and the more they support less strict laws, and I didn't even address the folks who want more strict gun laws. (When you ask them the same questions, many of them have the same reaction as "status quo" folk. They want "more", but they don't want things as strict as they already are.)
BTW - That's why the whole "assault weapon" campaign is political genius. The guns in question are "military" in the same sense that the cars that you can get at a Chevy dealer are race cars (that is, not at all). It plays on ignorance.
Then again, a large number of folks think that "tactical vest" means "bullet proof". (It means "lots of pockets"; think fishing vest, only black or camo fabric.)