Strange lines and black spots when baking

Hello,

I am trying to bake a gun model I made. The problem is that strange lines and spots appear on the handle. It is the only place in the whole model where it happens.

So far what I have done is:

-Check the model for loose or inverted normal faces. It has no ngons or intersections with other objects.

-I exported only the handle and the bake went fine. It is as if something happened when it is baked with the rest of the parts.

-I did not touch any of the bake settings, as I am not an expert and the default settings work fine for me. I wouldn't know what settings to modify to see if it fixes it.

I attached are a couple of screenshots highlighting the lines I am talking about. They appear in all the maps except the normals.

Thanks!