I just ordered a used FX T12 whisper synthetic .22 from AofA. I did a little research and they originally came with a Lothar Walther barrel. Now that they come with the smoth twist barrel I was wondering if I so chose, could I install a smooth twist barrel after removing the Lothar barrel? For the price I paid I am fine with whatever barrel is installed (one really can't go wrong with a Lothar, right!).