Decent quality on a budget - ABC RIFLE COMPANY AR-15 .223 Remington/5.56x45mm NATO Pistol 7in Barrel Custom 7in Top Cut Hybrid M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle

The builds on 7075 uppers with MPI fullauto bolts are great quality, very reliable, and excellent shooters. All three uppers I have used drop onto any lower that I tried without issues.

Plus, you get cerekote as a bonus treat. That's a heck of a bonus at this price point.

The core of it, from an old grey man, ABC 7075 uppers are fully the equal of the base model PSA's. Both are a little bit above Trybe. TacFire and BCA are behind them.

There are other affordable complete uppers out there, but why bother when ABC, PSA, and Trybe are available.