I'm only speculating, as I did the opposite (took the C&S fixed rear sight off my 325NG & put on an adjustable) of what you want, but the fixed sight was lower than the adjustable. (The front got changed to a .225" ramp from a .185" night sight.) I'd think the .300" would be too tall.
However much lower the fixed sight is than the existing adjustable is, that's how much lower the front will need to be to have the same POI as you have now.
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Last edited by BLUEDOT37; 10-28-2015 at 03:12 AM.
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