It seems that one can't go wrong with one from either Tromix or Rock River, if they'll fit the budget.
I see a lot of feeding and accuracy issues reported with "budget" uppers from Bear Creek Arsenal and Radical Arms.
Anyone ever deal with Pro2A Tactical out of Georgia?
Was looking at this upper:

https://pro2a-tactical.com/ar-...mod-upper-w-can.html

Just got one from Delta Team Tactical; Looks very good but I have not fired it yet. It cycles dry. I'll let you know how it works.
I used to build them but I can't make a barrel for what they charge for the whole thing now.

Thanks Tom.