Parts are starting to trickle in. Looks like my FFL recieved the Upper and Lower yesterday

Got the lower done, waiting for Optics Planet to ship the Barrel

Got it all together. Hoping to get it out this weekend to test fire it and get the gas block dialed in.

The rear take down pin is really hard to get in and out. Pretty much can't do it without a punch and hammer. I removed the little nut that holds the spring and detent in thinking that would loosen tension on the pin. It helped a little but not a lot. Any thoughts on that?

If the rear take down pin is tight, it’s gonna be tight until you wear it in.....after a few times look inside the hole to see if there is any wearing of the anodizing...if there is, you could remove some more with very fine sandpaper....
But I have an AR that I have to beat apart and back together with a hammer...I think it’s due to various tolerance stacking...doesn’t affect the accuracy. So I leave it alone.

And I’d tighten back up the rear plate to keep the detent and spring from going wonky.

I figured so, I lubed it up too

The plate is up tight, I just removed the little set screw.

If you're using the set screw to retain the rear takedown pin you need to trim a few coils off the spring to relieve that extra tension that keeps the detent seated on the takedown pin.