I didn't even think about large/small pins, as I thought that referred to the FCG pins. The pivot pin I have is actually mis-formed, as it gets way tighter when rotated, so I think it is ever so slight bent. I don't really have the right tools to measure the slight amount involved. A straight edge against a light didn't tell me anything, but it would rotate about 3/4's of it's travel before become too tight to turn.
And, as mentioned, I got the LPK from Aero Precision with the lower. I plan on picking up another pivot pin at some point and changing it out. My diameter reduction wasn't perfect, but it fits now, so I went all Honey Badger on it.

Jeff