The older ones secured the zero stop with a little sticker. Do a web search on install cds to vx6, -They have a short video on it. The problem is you need a new sticker every time you adjust the load-zero etc. As 199p says you can send to leupold and have the zero lock installed which allows you to reset the zero stop every time you change something, especially if you choose a moa turret rather than one for a specific load.
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