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I use Vortex ones on my scopes. They are good quality but in reality probably come out of the same factory in China as the no brand ones.

Having said that avoid the Vortex single screw lightweight...

I bought one years ago for my smallbore rifle. It was an Anschutz level that fitted into the foresight tunnel. First outing with it it drove me nuts. Raced from full one side full the other. Gave up...