I already have a brand new M-48-7 Classic Series .22 mag. Soon I'll be buying a brand new M-17-7 (matching dash numbers) .22 long rifle as temporary donor. . Going to switch cylinders, run tests and post the results. Heard numerous accounts in the past where matching dash 4's were switched without shaving lead or other problems,, want to see if the new dash 7's are that pliable too.