I've been offered an S&W Mod 28-2 Smolt (S&W w/Colt 6" Python bbl). It looks in excellent condition and it also has the original bbl with it. The bbl is pinned. No box and the grips are wood "Harrets" which look to have been orignally made for a K frame and opened for the N. Can the bbls be changed easily if I want to go back to the original bbl? Lock-up is tight and there is minimum end-shake. He's asking $700. Is this worth it? Thanks, Dennis