Not sure if people have discovered them yet, but I stumbled across MAS Defense this year when searching for parts. They have some really inexpensive AR parts that I haven't had any issues with to date(albeit it's only been a couple months). Specifically, I found their prices to be very reasonable on Ambi-CH($24), LPKs($19), Anti-rotation pins($12) that I can't distinguish from the KNS variety, blem uppers for $50 etc. They seem to still have several in-stock BA barrels at pre-Corona prices.
https://www.masdefense.com/LOWER-PARTS-AND-KITS-s/139.htm
*I have absolutely no relation with them, I've just been pleased so far with what I've received so i figured I'd relay what I've found*
https://www.masdefense.com/LOWER-PARTS-AND-KITS-s/139.htm
*I have absolutely no relation with them, I've just been pleased so far with what I've received so i figured I'd relay what I've found*