I picked up a Ruger GP100 with a three inch barrel. I would like to have this gun re-barrelled. (it has a nasty gouge in the rifling)(friend-don't ask) Is my only option to send it to Ruger and have them install it or do local gunsmiths usually carry these in stock? Has anyone ever had this work done to their gun? How much did it set you back? Also, the stock barrel has the 1/2 shroud. Could I get a barrel with the full shroud? What other options do I have? Thanks in advance!!