I have located a Savage Model 11 FCXP3 and Have a few questions. What I would like to do is build a 6mm Remington with a detachable flush fitting mag. I'll use a Boyds stock and a McGowen or Pacnor barrel. As near as I can tell the FCXP3 has a synthetic stock, non accu-trigger and detachable centerfeed magazine. The particular rifle I found does have the top bolt release. I'll replace the stock, trigger and barrel so my question centers around the magazine. I think this model has the cheaper bottom metal and magazine. Can this cheaper system (bottom metal and magazine) be replaced with the premium centerfeed system and are the parts available from Savage?