I accidentally bought the "vestian dynasty" two seconds after completing the queens wrath quest where you get it for free...

I was just on autopilot and my buddy already told me the gun you get so I clicked it when I turned in my quest not really thinking and suddenly I'm down 150 vanguard marks and I have 2 of the exact same gun that I'm never going to use even if I only had the one...

On that note why the fuck is that gun even for sale? Like you have to complete the quest where you get it as a reward to even unlock it so it's totally stupid to sell it- especially for so many God damn marks. Only reason to sell it is for people who dismantled it then changed their mind I guess?

Am I boned here? I don't play a super ton so that was like nearly all my vanguard marks :( (which I haven't spent any of cause I'm still just shy of vanguard rep 2.) it really sucks because I'm still only at 30 and I'm gonna have to grind forever again so I can buy some armour to upgrade my guy... Cause I've got this stupid gun instead.

Not really expecting anything because I'm pretty sure I'm screwed but ranting a little has helped. If there's anything I can do I's appreciate the feedback.

Thanks guardians.