After 55 years of mounting and using scopes on hundreds, yes hundreds of rifles, I have used my fair share of early Weaver rings and bases. I detested those early rings. They are difficult to say the least. Get the crosshairs lined up and level, tighten the screws and now the crosshairs are crooked. The cause is the mounting screws on one side only. I do like the weaver style bases built by quality manufactures like Warne. You can on old Weaver bases and the never higher quality manufactures remove the scope and remount it and only be slightly, @1" away from pre removal zero. For us that carried rifles daily but used them seldom this was a bonus. Dismount the scope and put it into your kit. When it was time to kill a deer simply reattach the scope and fill the freezer. Ruger's built in bases offer the same hitability after removal. I like this feature for my lifestyle. Doesn't mean beans to other. I have looked for good quality rings to fit Weaver style bases but have yet to find what I like. Another redeeming quality of the older Weaver rings is they were the only manufacturer of super low rings, which I prefer, so several of my guns still have the old style Weaver's as much as I would prefer something else. Once on and set I have had no failures from them even in the roughest uses.