You will spend more that it is worth - just buy a M65 or M66 3" bbl. If you can see your way clear to keep the 4", you will have two fine guns, if not, you can sell the M681 to help finance the M65 or M66. Aside from which, (and this of course is my personal opinion) why would you want to tote all the extra weight around to fire the same cartridge that the K frames do? Unless you shoot thousands of 357's out of a K frame, it will last you forever. Practice with 38 spl's. and pop off a few .357's for practice once in a while so you remain familiar with the power of the 357. The 3" K frames are highly sought after for this reason and remain one of the best carry pieces S&W ever produced! I too have an L Frame, but you will never see me carrying it. Too heavy and more importantly, too bulky to justify for firing the same exact cartridge as my smaller, lighter and very controllable 3" M65.

chief38