Bruce, if it's a Perazzi barrel, Giacomo can remove the center ribs, add two braces/barrel spacers and a new short rib up front. They also polish and reblue. Cost is between $325 and $400 depending. What you risk is barrel alignment. PBB was on of the first to have them do that, and the POIs of the two barrels was markedly different. Dan says they will reregulate if that happens.