So now that my lowers are in the 10 day hold, I figured I'd make sure that I have everything to go so that I can start assembly when I get it. Took out my PSA lpk and did a check list with the list I had on hand. After looking things over I am missing one of the roll pins, which one I am not sure. Can you purchase these from a hardware store or anywhere other than ordering online? I know I need to figure out which one I have, but figured I'd ask around to see if these only can be ordered online. I am hoping a little pin doesn't hold up my build.
Here is a pic of my parts for reference;
Here is a pic of my parts for reference;

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