For my shotgun, I am missing this part (or these parts) depicted in the following three (3) photos [
these are all photos which others have already posted in this thread so far]:

Al labeled those two parts as (48) Trip Spring and (49) Trip Pin
From the
Gun Parts Corp - Crass Hammerless website, I thought that was
part no. 1154850 - Cocking Bar Spring [PLEASE CORRECT ME IF I AM MISTAKEN], but regardless, the part I received did not fit as depicted in those three (3) photos, for it was too short to span the distance between the threaded hole and the smaller hole for the pin. I received a part like what Al showed, which is shorter than the other two photos with the (single, longer) part in place, as Jeff had initially posted. Additionally, I only received a single part, not two, i.e. I do not have a small diameter pin for that hole to retain the Barrel Locking Bolt...
Finally, can someone please explain the function of this part (these parts)?