I was shopping in a gun shop I know well, have bought from before, and bought from last week ... the day after Christmas

I was amazed at how empty their walls were. They had as many staff unboxing and tagging new guns as people doing paperwork and sending them out the door. The stockers were not making any headway, and I was there for an hour!
I asked how their supply was on uppers, and they told me uppers were in good supply so far. They are selling a little more than before, but stocks are good. He said they ran out of lower components first, complete lowers second, and complete AR's won't be around long. I asked if he had any idea on lead times from the different manufacturers. He told me they had orders in everywhere they can, and were ordering as allowed, but they are not taking any orders from customers at this time. Their concern is how long it will take to get combined with uncertainty over legislation. They want nothing to do with sold guns that can't be delivered once they arrive.
All of that said, they are willing to purchase used AR's customers bring in. Just don't expect huge premiums for them, because this shop is not raping buyers!