My weld script makes the model fall and not stick??

Im using welds to weld a Prop Gun to your chest when you unequip/equip the gun.

So when you unequip the gun, it goes onto your chest, and when you equip it, it disapears. I've done this before and it has worked. But now, the model just falls to the ground as if the weld doesnt exist.

game.ReplicatedStorage.EquipWeaponEvent.OnServerEvent:Connect(function(Player, Setting, ToolType, ToolName, ToolModel)
    if Setting == "Unequip" then
        if ToolType == "Primary" then
            local Tool = game.ServerStorage[ToolName.."_Model"]:Clone()
            print("Cloned")
            Tool.Parent = Player.Character
            Tool:MoveTo(Player.Character.UpperTorso.Position)
            local Weld = Instance.new("Motor6D")
            Weld.Name = "PrimaryTool_Weld"
            Weld.Parent = Player.Character
            Weld.Part0 = Player.Character.UpperTorso
            Weld.Part1 = ToolModel.Handle
        end
    elseif Setting == "Equip" then
        if ToolType == "Primary" then
            Player.Character:FindFirstChild("PrimaryTool_Weld"):Destroy()
            Player.Character[ToolName.."_Model"]:Destroy()
        end
    end
end)

Any reason why or some advice on how to fix?