Mike-lf your 629 Classic has removable FRONT sight blades they

can be easily switched or replaced as you see fit.. The height

is written on them... ex--.227''--.250''--.199''

They are available from S&w or Brownell. We silhouette shooters

can change the front sight out between banks of targets quicker

than trying to count clicks.. Push on your front sight with your

finger... lf it moves forward with tension you can switch them

in app 15 seconds... They aren't cheap. App $20 apiece... Last

til you lose one:-( Little springs and holder can get gone too.