Only the lower receiver.
Ask them if they will do transfers. If they do, ask how much they are. Then find the lower or rifle you want. Buy it. Give the seller the phone number of the FFL or phone them and ask them to forward their information to the seller. They will do so and call when it arrives. If you get a shipping delivery notification, call the FFL first. Some shops get deliveries in pallets.
I find that Gun Shops are not usually the best place to find specific information on a certain firearm. It may just be my luck though.
Everything but the lower can be shipped to your home.(Unless you live in an oppressed state.) Which will be infinitely easier than having it sent to the FFL. (Mine wondered why a single box of Greek, Thirty Aught Six cartridges showed up. Luckily I asked about them, he was using them as an attractive paperweight. Everyone is a "New Bee" at one time!
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And read this site a very great deal. As a younger human, some may try to take liberty with your lack of knowledge. Never be in a hurry! Know what you want first, before you buy it.
More than likely, though the evening "news" is sometimes grim, firearms aren't going anywhere.
Last and far from least, Welcome to the Club! The High Road, a clean, well lighted establishment!