What is 9mm marlin?

As an AI language model, I cannot find the "9mm Marlin" model of a firearm as no such model exists. The Marlin Firearms Company produces rifles and shotguns, most commonly seen in calibers such as .22LR, .30-30, and .45-70. Marlin does not manufacture semi-automatic pistols that use 9mm ammunition. Could you please provide more information about this particular firearm?