Model 12 FV in 223, eventually will replace the stock and convert to DBM. Looking at 1 piece base and am concernerned about top loading the mag with my old damaged fat fingers till I change the stock. I do tend to mount my scopes higher than average so a high rail height is not a problem. Looking for info and experience with the Talley PSM252725, EGW 81302, KenFarrel SAV-RTS-FS, Leupold 171337 or Warne 7666. Open to any other ideas in a 1 piece. steve