I guess I have never tried to put just the firing pin part of the bolt in. I always put the firing part into the the other part of the bolt with the piston and charging handle attached. Can't think of the actual names of the parts right now. I think the firing pin part you have sits lower than the other part of the bolt. I could be way off, but I would put the two parts together and try it.
You might need to do some altering, but that is one you figured out hte issue.
The reeiver is crushed together at all is it?