While it's probably been done, my recollection is that the bore of the .22 mrf is very slightly larger than that of .22 rf. Shouldn't involve extractor work, but I'd be reluctant to do it. The lowly rim fire cartridges generate a lot more pressure than we tend to believe. Yeah, yeah the cylinder walls are thick, that isn't the entire concern. They made the barrel bore larger for a reason.
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