BCA Upper accept other BCG?

[js8588]

I have this side charge upper & BCG from Precision Firearms on my 6.5 Grendel AR. You can also use a standard charging handle if you wish. You can't do that with a BCA upper. It might be above your price range though but if you decide on this unit, you'd have to thermal fit the barrel.

https://www.precisionfirearms.com/m8/2%2...eiver.html

This is going to be the next one I get. Nitride (Phalanx) because I don't like how NiB stains.