Bluedot, your eyes need re-calibration. I checked the spacing between the rear of the cylinder and the frame of both a 610 and an N frame in .45 ACP and they are both the same at 0.095". That is the space that is necessary for the thickness of the rim, plus the moon clip. I placed both guns side by side and the cylinders are the same length as are the frame windows.
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Tom
1560
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