PSA has their JAKL with 8.5'' 300BLK 4150CMV nitrided barrel, adjustable gas block, monolithic upper, MLOK handguard, and side folding brace for $1,099 currently here: https://flyingrich.com/5
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