If it's a "nice" model 10 4" HB don't screw it up with a barrel change. If you want a short barrel, sell the 10, and put the money toward something you want.
(exception to rule #1 below. Sell what ya got before you screw up a nice gun trying to make it something ya want!)
Cheapshooter's rules of gun ownership #1: NEVER SELL OR TRADE ANYTHING!