Only 300 of the original 5" 610s were made. Love mine! Trigger is one of the best factory triggers I have pulled on a S&W revolver. Very accurate for me. I now there was a run of 4" 610s, but we couldn't get them due to the barrel length restriction. Maybe S&W will do a 4.2" 610 in the future? Doubt it, but one can dream!
