Mike,
What was revealed as significant (to me at least) in the Ithaca trigger thread is that all three, Miller, Howland and Ithaca triggers have top tangs marked RSL and have identical function and nearly identical form. I have no idea on what makes/designs of single triggers were installed by Fox since I'm delinquent in re-reading my Fox book for this info.

Are you thinking that your gun has a post delivery single trigger?