So, back in 6th/7th Ed, Carcharodons had rules for their Chapter.
Reavers of the Outer Darkness: All models with Chapter
Tactics (Carcharodons) gain the Fear special rule. In addition,
any model in a Tactical squad with the Reavers of the Outer
Darkness Chapter Tactic special rule may exchange a boltgun
they are already equipped with for a close combat weapon
(eg, chainsword/combat blade) for free or be equipped with an
additional close combat weapon for +1 point per model. Such
changes must be represented on the model.
https://www.forgeworld.co.uk/resources/fw_site/fw_pdfs/Warhammer_40000/Forge_World_Space_Marine_Chapter_Tactics_V2.pdf
What are people doing with their Carcharodon tactical marines in 8th ed that are carrying chainswords?
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