I ordered the part from Browning and got it today and put it back together. I thought I would take a few photos to make it a bit easier for others to learn from my mistakes.Lay the gun on the left side and carefully remove the screw in the receiver after setting the trigger at half cock and opening the finger lever so the locking block disengages from the top of the receiver. If you don't open the finger lever, you cannot slide this puppy apart!! Carefully pull the two halves apart taking care to keep the ejector from flying apart and losing the spring. I held the ejector down when I pulled the butt assembly out of the receiver. This pic shows how the ejector fits in the receiver and covers the Ejector spring. This pic shows the internal part of the receiver and the bolt in place before disassembly. To remove the bolt, slide it forward, tip it forward so the locking block slides out of the side of the bolt. The metal cover that covers the locking block is in place in this photo. The locking block usually falls out when the bolt is removed. The metal cover is removed in this photo so you can see how the locking block is supposed to lay in the bolt recess. This is the top of the bolt showing the broken firing pin. This is a pic of the broken firing pin next to the new one. To remove the firing pin, just drift the pin holding the firing pin out of the bolt. The firing pin spring lays under the firing pin and needs to be installed before the new firing pin is put in place. The firing pin lays over the top of the spring, just slide it into the bolt. Drift the pin through the hole in the bolt and you are ready to reassemble!
There are two tricky steps that you need to be aware of. First is getting the locking block in its place on the bolt while making sure that the carrier guide pin is above the cocking lever link. If it isn't, the action won't slide back. You will definitely know if you don't get it in the right place. I hope I don't have to explain why I am emphasizing this point...
The second tricky thing is to hold the ejector in place with one hand while you slide the trigger and bolt assembly into the receiver. It isn't that bad, but it may take a couple of tries before you hit the groove and slide the butt assembly into the receiver. Line up the hole in the receiver and tighten the screw, clean up your mess and you are finished!
I do not own a BL22 but local dealer is always asking for my help with gun repairs 
your post may be very useful. Thank you again for taking the time to post it.. 
