Weaver showed, more than fifty years ago, that it was not that difficult to build a scope with usable adjustments. They also demonstrated it was possible to build scopes which were rugged. What they did not do was produce scopes with great optics. I have a couple of older Weaver scopes, US and Japanese, on silhouette rifles and they track perfectly. I have one Leupold and it works fine as long as I remember to adjust the windage, along with the elevation, when I move from point to point. If they could make scopes in El Paso which adjusted well, you would think the people in Oregon could do the same. GD
