Ah, yes, I meant another asset instead of the light on the flashlight. Thanks for answering!
Another silly question: is there a way to make the player have to find the weapon parts before being able to equip them to the gun? Like, the player would need to find the silencer before attaching it.

Sorry for the dumb question, but if I add, say, the flashlight asset into the equipment pack, will I be able to use the weapon wheel?
If the answer is obvious, then my bad.

You can modify Weapon Wheel through the Flash Source. Replace with any other weapon or add a new column. That depends on you. But if you need help about modifying it, I'm always here to help.

Another silly question: is there a way to make the player have to find the weapon parts before being able to equip them to the gun? Like, the player would need to find the silencer before attaching it.

I don't know if the attachments are deployable like weapons, but you can start with empty pack, then pick up the attachments with some message indicators, find the weapon and attach them via the Weapon Customization menu.