All of the j-magnum frame cyls should be the same length, if not I'll return it. I don't have calipers but by my ruler my cylinder is a hair over 1 9/16", whatever that would be in tenths.

As for fitting the cylinder, I'll send it and the gun to Mark Hartshorne for it. He did the other work on the gun and we've already discussed fitting cyls for other guns. He fits the cylinder to the existing hand, etc, so that both cyls work and are timed correctly.

Also, if you check around the forum, there are plenty of examples of successful cylinder swaps in all sorts of DA revolvers.

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