Like it says, the firing pin rotates as the action cycles.
Find a good gunsmith or machinist
A firing pin that is mounted on/in a hammer
Firing Pin Block
What should Firing pin protrusion measure?
If you look at the bolt face, a center fire rifle will have the firing pin located in the center of the bolt. A rimfire rifle will have the firing pin located on the outside edge of the bolt.
By action of the hammer striking the firing pin, forcing it into the primer.
What does pin look like
Firing pin is what strikes the back end of bullet igniting propellant
If you want a prop to look and sound like a real combat pump, get a geal one and remove the firing pin, or have a gunsmith do it for you. You can also have the chamber blocked to make it incapable of firing.
You can find a firing pin for the ranger at Numerick Gun Parts Corporation.
Try e-gunparts.com