Japanese I know LOVE shooting guns when they go to California or Hawaii. That's sometimes the first thing they want to do after getting of JAL and ANA at the airport. I saw Asians all over the place having fun with AK-47s and M-16s at an automatic weapons shooting range in Nevada a few years back.
I am not sure that Asians and Hispanics, after a few years (and particularly if in high crime areas) don't go out and buy themselves a little 'piece of the action' once they have settled in to the US for awhile. I don't think they will necessarily vote anti-gun rights.
A few months back there was an editorial in the local paper here about a Japanese foreign exchange student that was taken in by one of the host families here and when asked what are some of the things that he has enjoyed the most during his stay, he replied "learning how to shoot a gun".