I have a 6-1/2” 624 that has the red c. I found the box after I had called to check with the factory.
I’ve heard a couple different reasons for the recall.
One is the metal was not to spec. The other, and more likely to me, is the chambers were cut too deep, allowing .44 mags to slide in.
Be aware that if your gun is found to be “defective” the factory has no replacement cylinders.
Give them a call when they re-open. If it were mine, now, it would be a non-issue. I’d just shoot mild loads out of it. I have .44 magnums if I want to go “hot”.

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