I have a Colt lower and Colt upper and the pivot pin is having a hard time getting through the upper receiver. It's just impossible to get it through by hand and really hard to get it through with a punch. I have tried different pins and lowers and the issue persists. The same upper on different lowers yields the same results. Different uppers on the same lower work fine. Same with just pushing the pin through the lower without an upper attached. It's definitely the upper.
I can't find any burs or obstructions. My first instinct was the finish in the upper pin area was too thick and to grab the dremel and either:
1. Start on the pivot pin, reducing the diameter. The problem is that if I match the size of the upper, the far side of the lower may not fully engage and the pin won't seat properly.
2. Start removing the finish in the upper's pin area, which I really hate to do to an otherwise perfectly fine upper receiver.
Common sense took over, however, and I figure I'd check the hive mind here before I booger it up.
Any suggestions? Besides a new upper receiver? It's a built upper, so Colt warranty is really not an option.
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