They are at least equal to what is used by DD or BCM.
The barrels may be equal to BCM (same steel)... DD's are cold hammer forged in house... and are most definitely a step above that.
In case it wasn't obvious(it should have been)... I was referring to quality control in assembling those parts... not the forging process and metallurgy used to manufacture them.
I'm sure my 10 year old could take a set of parts from the DD warehouse and slap together an upper assembly... that doesn't mean it was built to the same standards as if it were build by Daniel Defense. Make sense?