From what I'm getting is this ghorn wasn't new you've had it for awhile? So then why does you ghorn have zero kills? Seems like you just put in the grimoire card to get a free weapon. Even if that's not the case Bungie doesn't replace items. Lost or dismantled or even not rewarded. Best of luck finding one!

*sigh* bungie will not replace lost items no exceptions. And if you are gonna say something use proper spelling and grammar.