I just purchased a used FWB 800 FT Basic, 12 fpe. I noticed there used to be a 15 fpe version as well. A little bit of digging revealed that the 12 fpe version has a 16.73" barrel, and the 15 fpe version has a 23.75" barrel. Does anyone know if both guns are "tuned" the same, and the only difference is the barrel length? Or, is the 15 fpe version tuned a little hotter because of the longer barrel? TIA for any help!!