I have several of the short cleaning rods for a 4" barrel. I'm not positive, but I think S&W used this same rod for 3 1/2" barrels. Please check if you need a rod for a 3 1/2" barrel. These are the rods used up until some time in the 1980's that have the loop at the end.

I'm looking to trade for the similar, but longer cleaning rods for 6" / 6 1/2" barrels or 8 3/8" barrels.

PM me if you are interested. Thank you.