Why is this happening when I try to move this one part?

So I am trying to animate a pistol


But any time I try to move a part know as “Muzzle” it moves everything else.
Why is this happening?
My workspace:
work

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This happens because apparently “Muzzle” is the root part of the gun. You need to change the root part by upping the RootPriority of another part or lowering the RootPriority of “Muzzle”.