The multi-tool has various heads you can use. I've used it to cut base molding and also light sanding in tight corners.
The rotary also have various heads you can use. Seems like you would need to buy all the attachments separately. Rotary tool is great for just about anything small or detailed you would need to do. I could see how you could mod nerf guns with this but would not know in what way you would mean to do it.
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