I always assumed steel rings and bases were better than aluminum at holding the scope and having all the screws stay tight. I mean to compare apple to apples so to speak I don't mean a 12 dollar aluminum component vs 150 dollar steel unit. After some research if I understand things correctly steel on steel has a lower coefficent of friction than aluminum on steel does . Does this mean if my scope tube is steel I should get a good set of aluminum instead of a good set of steel. Is there any advangatge to mixing steel and aluminum rings bases ?