You may have difficulty determining the difference in frame sizes with a single gun in the picture. You would need to know how big a particular frame size was and compare it to the rest. "J" is the smallest of the ones you listed and "N" is the largest. There is however, a new larger frame size to accommodate the very large new pistol cartridges. You would be better off going into a gun store and saying, "show me a J frame smith. Now show me an K frame", etc.
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