The only story I got that close enough is I was a gun show and the guy there had an SP89 for sale with the front pistol grip attached. I asked him if it's an AOW and he looks at me with this dumb look. So I try to explain to him that in order to have a front grip on that gun it needs to be registered as an AOW. Now I get an annoyed look and I was going to talk to him some more but I decided it's not worth it and not my problem anyway. I just walked away.