As I understand it, most pistol cartridges do not really benefit much from the longer carbine barrel compared to a full-size (5") pistol barrel. One of the exceptions to this rule is the .357 magnum; velocities are significantly higher from a carbine than from a revolver.
I owned a Marlin Camp 9 for a while. It was a nice little gun, but I decided that I'd rather just have a .22 for plinking/range use.
TMann
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