Ditto. I sold mine as well.
Printable View
In 2009 Trijicon made a new Red Dot Sight called the RMR (Ruggedized Miniature Reflex).
They're now putting the RMR on all of the ACOGs. They stopped making the TA31TRD in 2009 to make room for the new RMR models.
If you're looking for a TA31TRD "equivalent" you'll want to look at the following:
TA31RMR
and
TA31F-RMR