Quoted:
AAC won't be manufacturing any new silencers at their current facility.  They're moving to Alabama as I'm sure everyone here knows.  So in order to control costs they won't be manufacturing new NFA items in their current location.  That's why Quiet Riot and Silencershop have been blowing out Tirants.  So to answer the OP my guess is they haven't discontinued it completely, they're turning the wheels answering questions about a silencer that won't be produced for some time and decided to remove it from the web page to save time for both customers and their employees.  If you were holding out for a Ranger 3 I would look for a 556 SD and have it pinned and welded instead.  They're in stock, inexpensive, and a pretty good can.  Hope this helps, and if I have to guess AAC will be back in full swing around second quarter next year.  Don't be discouraged, as soon as the move is over everything should return to normal and we will see some more great products along with some new stuff if I was a betting man.