I always take steel mounts before considering Aluminumumum! As I like the workmanship that is put into them,but nothing wrong with well made aluminun made correctly. If you are making a light weight hunting rig this is the only way to go! I just think aluminum looks very very cheap, and you ussually don't ever get you money back if you go to sell them, just my experiance? look at what an Weaver style aluminum ring sell for resale, then look what a set of Sakko or Tikka rings sell resale ,atleast 5 times more, regards Dale Z!