Why don't you sell it to someone with a 12(6) and use the money to buy something you need or like.
Unless this would be kept in memory of the officer killed and from your post, this does not appear to be the case.
Duke1
PS. Is this an RCMP issued gun? - I see you collect RCMP memorabilia and if this is the case, the situation might different as to what you should do with it.
Will send you a PM regarding your collecting activities.