Today I received a call from my FFL that the PSA 16" MID-LENGTH complete UPPER I ordered earlier in the week had arrived. So of course I dropped everything and went to go pickup my new toy. When I got there, I looked it over and everything looked good. After I got home I had to log in to finish up some work, so I had to wait a bit before oiling it and pairing it to its upper. However, when I pulled out the bolt carrier group and turned the upper upside down I had a small pin and spring fall out and onto the table. I have been looking it over for the past couple of hours and cannot to the life of me figure out where they go. I am hoping someone on here can help point me in the right direction. Any help you can provide is greatly appreciated.
The first picture is the upper with the bolt removed. The last picture is the pin and spring in relation to the bolt carrier group.
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