Quoted: One question. The pivot pin was really tight to get through the upper. I ended up having to whack it in and it doesn't seem to want to come out. Will that loosen up after shooting it a bit?
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Maybe.
Take the upper off. Move the pivot pin back and forth. If the pivot pin is extremely tight across the entire distance, then either the lower is out of spec, or the pivot pin is too large (likely the pin is too big)
If the pin is loose until the very end, where it snaps into place, and then gets REALLY tight for the last 1/8", then it is likely the pin is again out of spec, and part of the pin is rubbing part of the lower.
If it is only tight when the upper is installed.... go shooting. It will loosen up. I like to take mine and work them back and forth dry, to break them in a bit... then apply a little moly grease to the pins, especially the detent holes.