I've used EGW 20-MOA bases on a couple Mark IIs and they worked fine right out of the package. I've never used one of the 0-MOA bases though.
When ordering keep in mind that some of the Mark II rifles actually use a 93-series base. If the ejection port is 1-3/8" you need the standard Mark II base. If you have a newer rifle with an ejection port that measures 1-5/8" then you'll need a base made for the 93-series.
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