Be very careful when tightening copper john sights. I currently own a Dead nuts pro and managed to overtighten my windage adjustment on my bracket and stripped out the screw. You are better off putting some blue loc-tight (The blue stuff is the stuff that can be undone) on the screws to keep them tight. This is something to becareful of when using regular metal screws with aluminum, the screws are harder than the soft aluminum which then makes it easier to strip out the threads. But don't worry if you do strip them out, Copper John has great customer service and replaced my bracket for free even though I was the one who overtightened it.