You must go to a gunsmith.
Try e-gunparts.com
Believe that is a Marlin 101. Contact Numrich at their website- gunpartscorp. They list that firing pin for $5 plus shipping,
gun shop, gun show, want ad.
Try to fire it then if it does not fire the firing pin isnt in
Find a good gunsmith or machinist
Yes the firing pin should float freely on top of the breech bolt. If you take the gun down (seperate the receiver) the firing pin will be visible, and should slide freely backa and forth.
Take out the screws?
Best left to a gunsmith
To remove the firing pin from a Ruger P89, first ensure the firearm is unloaded and the magazine is removed. Disassemble the pistol by removing the slide from the frame, then take out the recoil spring and barrel. Next, locate the firing pin retaining pin at the rear of the slide, remove it, and then carefully pull out the firing pin along with the firing pin spring. Always follow safety protocols and consult the owner's manual for specific instructions.
Take it to a gunsmith. Remove cylinder - remove firing pin pin located under rear site - use finishing nail/small center punch ,place against back of firing pin and tap lightly driving pin toward "removed" cylinder
A firing pin that is mounted on/in a hammer
The purpose of Beretta's firing pin catch is to prevent the firing pin from going forward from in the event that the pistol is dropped. It's just simply redundancy, every precaution to not put little holes into your body is taken.