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Good luck.. finding parts right now is a nightmare. I'm in the process of building one right now and I'm about to send everything back and buy a complete rifle. (I also have an 80% lower)
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Patience grasshopper.
These things happen. Parts go out of stock ALL THE TIME. Multiple times a year. Guess what? They come back in stock as well.
But with the popularity of building 308 now, mfgs can't keep up with demand. You don't want to rush the industry because then they cut back on QC just to get units it the door and fix them later. Which leaves bitter tastes.
Just be patient. Just watch, you're going to send everything back, then 2 days later get a ton of notices about restocked parts.
Anyways, on the 80%, it's good practice to get both upper and lower from same place. If they don't offer an upper, you'll need to test for some to see if they work. Not all do.
Good luck, and have fun!