The Custom Slide of the LEO is a marketed part for the American-made Springfield Armory XDM, as evident by the side serrations, and thus will not realistically bear any mentioning to "HS Firearms Croatia" like the in-game iteration.
Despite being a ported slide, a LEO fitted with this mod can still be silenced, and muzzle brakes/compensators attached to it still function. Furthermore, the modification does not impose an Accuracy reduction despite having compensator ports.
While the part's textures have "5.25" stamped onto its side, indicating a slide length of 5.25 inches, the slide proper is nowhere near as long. This error is present also in the Long Slide which, despite being visually longer, is still far too short.