And your bolt should look similar to this one from my B2k4 Standard (non-PDS):
Looking inside the back of the bolt, you should see a hex bolt. This is the retainer for a ball bearing and spring that hold the bolt in. You may need to tighten it, and the bearing will protrude into the pin hole. If the bolt pin will not stay in place, don't test fire the gun. You may get the bolt in your face.
Good luck.......
Walker