My first reaction was going to be - no don't fire it, you'll greatly devalue it. That was until I got to your reason for wanting to fire it. That is certainly a noble reason to fire it and makes your decision extremely difficult. Have you considered an alternative, that is to try to find a gun similar to the one your brother carried, perhaps from the same year, and fire that instead? This would be a fitting tribute and at the same time would keep the memorial gun as pristine as it should be. In the long run, it would also be cheaper. But that reason is far down the list considering your feelings for your brother.
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