Mass Exporting/Reimporting Meshes

I’m looking to export some mesh creations and modify them in Blender, but I don’t want to go through the process of exporting each individual part.

Is it possible to export a mesh from Roblox to a file and reimport it, but on a large scale?

For example, I would like to be able to modify a gun with, say, 20 meshes in its model, but without having to manually export and then reimport each mesh and get it placed properly.

Would appreciate any help possible!