Gun not working properly as tool

Hello, I’ve created a gun:
image
and it has the structure below:
image

When adding this into a tool, this happens:

Do you know how to fix this?

Thanks!
windingtheropes

that usually happens because one of the parts is anchored. all the parts must be unanchored

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do i have to weld the other parts for them to work, right now only the handle attaches to the hand when everything else is unanchored.

yes, all parts have to be welded