whats this function ?

[frodo]

building a mauser, I received my bolt.
upon fitting the bolt, [6 hours with a file]
inoticed a 2nd pin on my trigger control, the rear pin is the fire pin release
wth is the function of the front pin.

posted pictures show the pin, and the bolt. pin rests in the flat spot on bolt when bolt is inserted/cocking position

when cocked, it rest in the notch in the picture

you can see the drag marks on the bolt, i filed the pin, it drags no mo