I have a Model 48-3 that has a 22 long rifle cylinder. Would like to fit a 22 mag cylinder to it. Numrich sells the 22 mag cylinder for Models 2 and 4 but not the Model 3 cylinder. I understand that there is some difference in the gas seals? What is the difference and can I modify (machine or bush) the Model 4 cylinder to fit my Model 3 revolver?