I am partial to BCM. They are one of the best built AR's on the market right now.

The upper I bought from them was the same as filthy 14. Thats the AR Pat Rodgers torture tested by not cleaning it and I They shot around 40,000 rds with one cleaning after about 26,000 rounds. Just lube.

Pats a really good guy and I trust him.

The upper is the heart of an AR. That's where the magic happens. While I prefer a high quality lower the truth is there are only 3 or 4 mass manufacturers. Mnay different names are engraved on the same lowers. With a little research you can find who makes what. Mil Spec is Mil Spec.