PSA has their upper with 10.5'' 5.56 FN America CHF chrome lined MP/HP tested barrel, Toolcraft NiB BCG with 158C MP tested bolt, MLOK rail and charging handle for $479 shipped currently here: https://flyingrich.com/3
This build was sponsored by IG:@invaderZip_ & IG:ZavairFirearms AKA http://22mods4all.com
Here is the lower to complete your AR-10!
PSA BLEM PA-10 Gen 3 Stripped Lower Receiver | Palmetto State Armory https://flyingrich.com/13