Quote Originally Posted by jmoore View Post
The square hole is the recess for the locking block which allows it to swing away from the bolt locking recesses during recoil.

You have the firing pin, it just needs the tip replaced. Pretty common repair, actually.
If you are careful, you don't even need a lathe to do a good job. A short length of drill bit shank can serve as the new tip.

I do have the firing pin but it has been cut. It looks like someone wanted to make sure it wouldn't be able to fire. It will be difficult to repair but I am confident I can if I can get my hands on an original for measurements. Thanks.

Mdrim13