As HighValleyRanch already mentioned, the LCR and LCRX have two different frame types. The magnum frames are a little bigger and a little heavier than the ones used for rimfire and .38 special.
Another advantage is that cleaning the chambers is a little easier. Shooting shorter cartridges in longer chambers, such as .38 special in a .357 revolver or .32 H&R Magnum in a .327 revolver, causes crud to build up against the little shoulder inside the chamber.
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