I have 3 rifles with Williams sights on them, 2 levers and a Mini-14. No complaints at all with the lever sight design. For the Mini I have one - you have to unscrew the aperture to adjust the elevation. And with the Mini, you have to do that a lot more frequently than with most any other gun on earth. But the Williams is still infinitely better than the POS Ruger puts on it at the factory.