Cannonman
Why, YES . . . . actually. Your reproduction is probably a Uberti, from Italy. The "pin" you mention is actually the lower tab for the Trigger Block Safety bar. In the Italian gun, the Safety Bar is powered by a rather "stout" spring. The spring needs replaced by an after-market spring, from Cowboys and Indian Store, Pioneer Gunworks, or Slix Springs.
If your reproduction is a Miroku from Japan, the safety is powered by a wire spring. That spring needs modified or replaced as well. I believe a replacement is available from Shotgun Boogie.