Fate's Whisper - subclass quest

[funtomas]

Hello, I have a really bad problem. I did all i had to, and when Reorin asked me, what B grade weapon I'll bring him (for obtain low grade A), I mistakenly choosen Kaim Vanul's Bones  . Is there any chance to deal with it without abort the whole quest? Please, help me!   

[Souten]

only to get the item,or abort quest and do it one more time:|

[Green]

make any top B except dual SLS and exchange it with mammon BS for weapon you mentioned