Everything functions in my Marlin Model 39 lever action circa 1920s; but I had to fit a modern breech bolt to handle the hi-vel ammo.
The S-prefix serial number 39 breech bolts were only able to handle standard velocity stuff.[/QUOTE]
I'd like to hear more about how you fit a modern breech bolt to your old 39. I'll be taking possession of a 20s model 39 soon and may decide to do the same. Where did you get the modern breech bolt and what did you have to do to make it work in the old gun?