I did no smoking this year. We had a small gathering, Susan, my dad, one brother and me. We bought from a store and only reheated. It was actually pretty good.
We did make my mom's chocolate cake for dessert.
I am sure others will come along with their knowledge soon. However, I don't think there should be an upper without feed ramps. Got any pictures of one, or a link to to an example about which you are inquiring?
Get an Aero lower. It will work with your upper. There are others that may fit, but getting receivers from the same manufacturer is the best bet.
This is a good spot to get a stripped lower.