Works great - Primary Arms Slide Mount Magnification Flip Lever

This flip lever for Primary Arms GLx series scopes is functionally better than any other lever I've tried. When folded down it still allows easy zooming but in the up position it has incredible leverage. Truly effortless.

The only initial concern I had was long term durability but after a year it's been holding up well. I agree with another review that it is expensive for what it is, but given the OEM design there is no alternative as a bolt on solution. This won't slip or shift.