text: Oh side note these uppers usually have tighter tolerances and may not like steel the first 500 roundsThe gas block come wide open from factory so don't adjust thatIf you really really want to use crappy steel .... Fill chamber with baking soda and dump 20-40 rounds through it.Then very very thoroughly clean weapon and oil..This will reduce the tolerance (wear out some) the chamber and related partsReducing accuracy a little bitI've done this a couple times - always worksBut will allow for the lacur and steel case abnormalities to run smootherI do suggest just run brassBut just as a note